0% Interest Financing and Lennox Rebates Up to $1,800
Request Service Call Now Contact Us Coupons

Adam Phelps

Adam Phelps

Installation Manager

Rating

Reviews

LICENSES: JOURNEYMEN PLUMBER, GAS SERVICE

With 32 years in the HVAC industry and 30 of those at GSMS, Adam brings a wealth of experience and a
commitment to excellence to his role as Director of Installation. Drawn to the trades by the diverse
opportunities it offers, Adam ensures that every installation is done with future service in mind, making it easier
for our technicians down the road. In his free time, Adam enjoys relaxing, watching movies, and spending time
outdoors. Guided by the motto “keep on truckin’,” Adam values the good people he works with at GSMS and is
proud of the high standards his team maintains in every project.

Name: Adam Phelps

Recent Jobs and Reviews

Rated 5.0 out of 5 stars based on 33 customer reviews

Customers say: The recent reviews exhibit a predominantly positive sentiment, with recurring themes of satisfaction, professionalism, and expertise. Customers express gratitude, recommend the company, and acknowledge the quality of the work performed. Positive reviews frequently mention friendly and knowledgeable technicians, timely responses, and efficient service. Negative reviews are minimal and do not represent a clear, recurring trend. Overall, the reviews suggest a positive experience with the company, with many customers expressing satisfaction with their HVAC and plumbing needs.

Job Locations and Reviews

This proposal outlines the installation of a premium 5-Zone Mitsubishi heat pump system. To honor your request of having only one outdoor unit while properly serving all three levels of the home (basement, first floor, and second floor), we have upgraded the design to utilize Mitsubishi’s advanced Smart Multi system. This commercial-grade technology uses a centralized "Branch Box" distribution method, allowing us to run the extended refrigerant line lengths required for this specific floor plan while strictly adhering to manufacturer engineering specifications.

Scope of Work

1. Outdoor Equipment & Distribution

Condenser Placement: Supply and install one (1) Mitsubishi Smart Multi outdoor heat pump condenser. The unit will be located on the gable end of the home (garage side), neatly tucked into the corner where the chimney jogs out.

Attic Branch Box: Install the required Mitsubishi Branch Box up in the attic space. The main refrigerant trunk line will route from the outdoor unit up
This proposal outlines the installation of a premium 5-Zone Mitsubishi heat pump system. To honor your request of having only one outdoor unit while properly serving all three levels of the home (basement, first floor, and second floor), we have upgraded the design to utilize Mitsubishi’s advanced Smart Multi system. This commercial-grade technology uses a centralized "Branch Box" distribution method, allowing us to run the extended refrigerant line lengths required for this specific floor plan while strictly adhering to manufacturer engineering specifications.

Scope of Work

1. Outdoor Equipment & Distribution

Condenser Placement: Supply and install one (1) Mitsubishi Smart Multi outdoor heat pump condenser. The unit will be located on the gable end of the home (garage side), neatly tucked into the corner where the chimney jogs out.

Attic Branch Box: Install the required Mitsubishi Branch Box up in the attic space. The main refrigerant trunk line will route from the outdoor unit up
Adam P.
Adam P. Checked in
This proposal outlines the installation of a premium 5-Zone Mitsubishi heat pump system. To honor your request of having only one outdoor unit while properly serving all three levels of the home (basement, first floor, and second floor), we have upgraded the design to utilize Mitsubishi’s advanced Smart Multi system. This commercial-grade technology uses a centralized "Branch Box" distribution method, allowing us to run the extended refrigerant line lengths required for this specific floor plan while strictly adhering to manufacturer engineering specifications. Scope of Work 1. Outdoor Equipment & Distribution Condenser Placement: Supply and install one (1) Mitsubishi Smart Multi outdoor heat pump condenser. The unit will be located on the gable end of the home (garage side), neatly tucked into the corner where the chimney jogs out. Attic Branch Box: Install the required Mitsubishi Branch Box up in the attic space. The main refrigerant trunk line will route from the outdoor unit up
Merrimack, NH 03054
This proposal outlines the installation of a 3-zone Mitsubishi Hyper Heat ductless system for your home. Because this system will be a primary heat source for the bedrooms, I am utilizing the advanced FX Series indoor heads. These specific units are engineered to deliver their true, rated heating BTUs even in the bitter cold, ensuring your family stays perfectly warm all winter long.

Scope of Work

1. Outdoor Equipment & Site Prep

Condenser Installation: Supply and install one (1) multi-zone Mitsubishi Hyper Heat outdoor condenser on the back side of the home.

Site Preparation: As we discussed during my visit, you will be removing the existing section of fence prior to our arrival so we have the necessary clearance to position the unit in its optimal location.

Winterization: Because this is a Hyper Heat system, we will mount the unit on a heavy-duty snow stand and install a protective weather baffle ("ice hat") to protect the fan motor and coils from winter snow and ice accumulatio
This proposal outlines the installation of a 3-zone Mitsubishi Hyper Heat ductless system for your home. Because this system will be a primary heat source for the bedrooms, I am utilizing the advanced FX Series indoor heads. These specific units are engineered to deliver their true, rated heating BTUs even in the bitter cold, ensuring your family stays perfectly warm all winter long.

Scope of Work

1. Outdoor Equipment & Site Prep

Condenser Installation: Supply and install one (1) multi-zone Mitsubishi Hyper Heat outdoor condenser on the back side of the home.

Site Preparation: As we discussed during my visit, you will be removing the existing section of fence prior to our arrival so we have the necessary clearance to position the unit in its optimal location.

Winterization: Because this is a Hyper Heat system, we will mount the unit on a heavy-duty snow stand and install a protective weather baffle ("ice hat") to protect the fan motor and coils from winter snow and ice accumulatio
Adam P.
Adam P. Checked in
This proposal outlines the installation of a 3-zone Mitsubishi Hyper Heat ductless system for your home. Because this system will be a primary heat source for the bedrooms, I am utilizing the advanced FX Series indoor heads. These specific units are engineered to deliver their true, rated heating BTUs even in the bitter cold, ensuring your family stays perfectly warm all winter long. Scope of Work 1. Outdoor Equipment & Site Prep Condenser Installation: Supply and install one (1) multi-zone Mitsubishi Hyper Heat outdoor condenser on the back side of the home. Site Preparation: As we discussed during my visit, you will be removing the existing section of fence prior to our arrival so we have the necessary clearance to position the unit in its optimal location. Winterization: Because this is a Hyper Heat system, we will mount the unit on a heavy-duty snow stand and install a protective weather baffle ("ice hat") to protect the fan motor and coils from winter snow and ice accumulatio
Concord, NH 03303
Project Overview

Proactively replace the failing existing furnace with a new Lennox Elite Series (EL296V) Two-Stage Gas Furnace. This option retains your existing air conditioning equipment and provides a reliable, high-efficiency heating upgrade with a completely refreshed standard zoning system.

Scope of Work

1. Equipment & Ductwork

Furnace: Install one (1) Lennox EL296V Two-Stage Gas Furnace.

Coil Adaptation: Fabricate custom sheet metal transitions to adapt the new furnace to your existing indoor A-coil.

Filtration: The existing return drop and Air Bear media cabinet are in excellent condition and will be retained.

2. Gas, Venting & Drainage

Gas Piping: Remove the existing CSST flexible gas drop and pipe in a new solid black iron gas drop to the furnace for enhanced safety and durability.

Venting: Remove the existing concentric vent. Install a new 2-pipe PVC intake and exhaust venting system.

Condensate: Reconnect to the existing condensate drain line routed to the exteri
Project Overview

Proactively replace the failing existing furnace with a new Lennox Elite Series (EL296V) Two-Stage Gas Furnace. This option retains your existing air conditioning equipment and provides a reliable, high-efficiency heating upgrade with a completely refreshed standard zoning system.

Scope of Work

1. Equipment & Ductwork

Furnace: Install one (1) Lennox EL296V Two-Stage Gas Furnace.

Coil Adaptation: Fabricate custom sheet metal transitions to adapt the new furnace to your existing indoor A-coil.

Filtration: The existing return drop and Air Bear media cabinet are in excellent condition and will be retained.

2. Gas, Venting & Drainage

Gas Piping: Remove the existing CSST flexible gas drop and pipe in a new solid black iron gas drop to the furnace for enhanced safety and durability.

Venting: Remove the existing concentric vent. Install a new 2-pipe PVC intake and exhaust venting system.

Condensate: Reconnect to the existing condensate drain line routed to the exteri
Adam P.
Adam P. Checked in
Project Overview Proactively replace the failing existing furnace with a new Lennox Elite Series (EL296V) Two-Stage Gas Furnace. This option retains your existing air conditioning equipment and provides a reliable, high-efficiency heating upgrade with a completely refreshed standard zoning system. Scope of Work 1. Equipment & Ductwork Furnace: Install one (1) Lennox EL296V Two-Stage Gas Furnace. Coil Adaptation: Fabricate custom sheet metal transitions to adapt the new furnace to your existing indoor A-coil. Filtration: The existing return drop and Air Bear media cabinet are in excellent condition and will be retained. 2. Gas, Venting & Drainage Gas Piping: Remove the existing CSST flexible gas drop and pipe in a new solid black iron gas drop to the furnace for enhanced safety and durability. Venting: Remove the existing concentric vent. Install a new 2-pipe PVC intake and exhaust venting system. Condensate: Reconnect to the existing condensate drain line routed to the exteri
Derry, NH 03038
Manchester, NH - Installed a new 40 gallon atmospheric natural gas water heater
Adam P.
Adam P. Checked in
Installed a new 40 gallon atmospheric natural gas water heater
Manchester, NH 03109
Adam P.
Adam P. Checked in
Replaced evaporator coil. Pressure check,evacuated,charged
Manchester, NH 03104
This is our highly recommended design utilizing premium Mitsubishi equipment. It utilizes the exact same second-floor layout and standard heat pump capabilities as Design 1, but upgrades the third-floor unit to a low-profile Floor-Mounted Console. Given the specific dimensions and ceiling angles of your third floor, this option provides the absolute cleanest aesthetic and optimal airflow.

Scope of Work

1. Indoor Equipment (Third Floor - Floor Mount)

Third Floor Space: Install one (1) Mitsubishi Floor-Mounted ductless console.

Layout Adjustment: As we discussed during our consultation, utilizing this floor-mounted unit will require a minor rearrangement of the craft table furniture, but it guarantees the most unobtrusive and visually pleasing installation for this unique space. The exterior lines will drop down to meet the second-floor lines in a "T" and run horizontally along the roofline.

2. Indoor Equipment (Second Floor)

Back Guest Bedroom: Install one (1) Mitsubishi wall-moun
This is our highly recommended design utilizing premium Mitsubishi equipment. It utilizes the exact same second-floor layout and standard heat pump capabilities as Design 1, but upgrades the third-floor unit to a low-profile Floor-Mounted Console. Given the specific dimensions and ceiling angles of your third floor, this option provides the absolute cleanest aesthetic and optimal airflow.

Scope of Work

1. Indoor Equipment (Third Floor - Floor Mount)

Third Floor Space: Install one (1) Mitsubishi Floor-Mounted ductless console.

Layout Adjustment: As we discussed during our consultation, utilizing this floor-mounted unit will require a minor rearrangement of the craft table furniture, but it guarantees the most unobtrusive and visually pleasing installation for this unique space. The exterior lines will drop down to meet the second-floor lines in a "T" and run horizontally along the roofline.

2. Indoor Equipment (Second Floor)

Back Guest Bedroom: Install one (1) Mitsubishi wall-moun
Adam P.
Adam P. Checked in
This is our highly recommended design utilizing premium Mitsubishi equipment. It utilizes the exact same second-floor layout and standard heat pump capabilities as Design 1, but upgrades the third-floor unit to a low-profile Floor-Mounted Console. Given the specific dimensions and ceiling angles of your third floor, this option provides the absolute cleanest aesthetic and optimal airflow. Scope of Work 1. Indoor Equipment (Third Floor - Floor Mount) Third Floor Space: Install one (1) Mitsubishi Floor-Mounted ductless console. Layout Adjustment: As we discussed during our consultation, utilizing this floor-mounted unit will require a minor rearrangement of the craft table furniture, but it guarantees the most unobtrusive and visually pleasing installation for this unique space. The exterior lines will drop down to meet the second-floor lines in a "T" and run horizontally along the roofline. 2. Indoor Equipment (Second Floor) Back Guest Bedroom: Install one (1) Mitsubishi wall-moun
Lee, NH 03861
This proposal outlines the installation of high-efficiency 4-Zone Mitsubishi ductless mini-split system. This system is engineered to provide perfectly zoned, independent summer cooling, as well as highly efficient supplemental heating during the shoulder seasons for both the upstairs and basement living spaces.

Scope of Work

1. Outdoor Equipment Installation

Condenser Placement: Supply and install one (1) Mitsubishi 4-Zone outdoor heat pump condenser. The unit will be professionally mounted on the exterior gable end of the home, located to the right of the existing electrical meter.

2. Indoor Air Distribution (4 Wall-Mounted Units)

Supply and install four (4) precisely sized Mitsubishi wall-mounted ductless air handlers in the following dedicated zones:

Zone 1: Basement Living Room: Mounted on the entry wall adjacent to the electrical panel for optimal airflow distribution across the living space.

Zone 2: Basement Bedroom: Strategically mounted on the back wall near the right r
This proposal outlines the installation of high-efficiency 4-Zone Mitsubishi ductless mini-split system. This system is engineered to provide perfectly zoned, independent summer cooling, as well as highly efficient supplemental heating during the shoulder seasons for both the upstairs and basement living spaces.

Scope of Work

1. Outdoor Equipment Installation

Condenser Placement: Supply and install one (1) Mitsubishi 4-Zone outdoor heat pump condenser. The unit will be professionally mounted on the exterior gable end of the home, located to the right of the existing electrical meter.

2. Indoor Air Distribution (4 Wall-Mounted Units)

Supply and install four (4) precisely sized Mitsubishi wall-mounted ductless air handlers in the following dedicated zones:

Zone 1: Basement Living Room: Mounted on the entry wall adjacent to the electrical panel for optimal airflow distribution across the living space.

Zone 2: Basement Bedroom: Strategically mounted on the back wall near the right r
Adam P.
Adam P. Checked in
This proposal outlines the installation of high-efficiency 4-Zone Mitsubishi ductless mini-split system. This system is engineered to provide perfectly zoned, independent summer cooling, as well as highly efficient supplemental heating during the shoulder seasons for both the upstairs and basement living spaces. Scope of Work 1. Outdoor Equipment Installation Condenser Placement: Supply and install one (1) Mitsubishi 4-Zone outdoor heat pump condenser. The unit will be professionally mounted on the exterior gable end of the home, located to the right of the existing electrical meter. 2. Indoor Air Distribution (4 Wall-Mounted Units) Supply and install four (4) precisely sized Mitsubishi wall-mounted ductless air handlers in the following dedicated zones: Zone 1: Basement Living Room: Mounted on the entry wall adjacent to the electrical panel for optimal airflow distribution across the living space. Zone 2: Basement Bedroom: Strategically mounted on the back wall near the right r
Concord, NH 03303
This proposal outlines the replacement of your aging oil boiler and internal tankless hot water coil. We have designed this upgrade around the ultra-efficient Energy Kinetics System 2000 Resolute.

Unlike your current setup, this highly advanced, low-mass boiler eliminates standby heat loss, drastically reducing your annual oil consumption. Furthermore, the Resolute model allows for direct sidewall venting, which means we can completely eliminate your current noisy power vent setup in favor of a much quieter, cleaner, and safer dedicated intake and exhaust system.

Scope of Work

1. Equipment Removal & Venting Modernization

Demolition: Safely drain, disconnect, and remove the existing oil boiler.

Power Vent Elimination: We will completely remove the existing, noisy power vent. The new System 2000 Resolute utilizes direct sidewall venting, meaning we will pipe dedicated fresh air intake and exhaust directly through the exterior wall.

2. High-Efficiency Boiler & Hot Water Installation
This proposal outlines the replacement of your aging oil boiler and internal tankless hot water coil. We have designed this upgrade around the ultra-efficient Energy Kinetics System 2000 Resolute.

Unlike your current setup, this highly advanced, low-mass boiler eliminates standby heat loss, drastically reducing your annual oil consumption. Furthermore, the Resolute model allows for direct sidewall venting, which means we can completely eliminate your current noisy power vent setup in favor of a much quieter, cleaner, and safer dedicated intake and exhaust system.

Scope of Work

1. Equipment Removal & Venting Modernization

Demolition: Safely drain, disconnect, and remove the existing oil boiler.

Power Vent Elimination: We will completely remove the existing, noisy power vent. The new System 2000 Resolute utilizes direct sidewall venting, meaning we will pipe dedicated fresh air intake and exhaust directly through the exterior wall.

2. High-Efficiency Boiler & Hot Water Installation
Adam P.
Adam P. Checked in
This proposal outlines the replacement of your aging oil boiler and internal tankless hot water coil. We have designed this upgrade around the ultra-efficient Energy Kinetics System 2000 Resolute. Unlike your current setup, this highly advanced, low-mass boiler eliminates standby heat loss, drastically reducing your annual oil consumption. Furthermore, the Resolute model allows for direct sidewall venting, which means we can completely eliminate your current noisy power vent setup in favor of a much quieter, cleaner, and safer dedicated intake and exhaust system. Scope of Work 1. Equipment Removal & Venting Modernization Demolition: Safely drain, disconnect, and remove the existing oil boiler. Power Vent Elimination: We will completely remove the existing, noisy power vent. The new System 2000 Resolute utilizes direct sidewall venting, meaning we will pipe dedicated fresh air intake and exhaust directly through the exterior wall. 2. High-Efficiency Boiler & Hot Water Installation
Pembroke, NH 03275
Adam P.
Adam P. Checked in
Replacement of failing oil-fired hot water heater with a new hybrid electric water heater. A new dedicated 240V electrical circuit will be installed from the panel to the water heater location. Existing oil flu will be capped off. A condensate pump for moisture removal will be installed.
Bedford, NH 03110
This proposal outlines the complete replacement of your existing Lennox R-410A two-zone mini-split system. We will be upgrading the equipment serving your Master Bedroom and Great Room to ensure reliable, high-efficiency cooling and supplemental heating.

To provide the most cost-effective and clean installation possible, we will be reusing the Fortress line hide and heavy-duty exterior wall bracket that our team previously installed, while completely replacing all the internal working components (copper, wiring, and equipment).

Scope of Work

1. Equipment Removal & Preparation

Safely disconnect, recover existing refrigerant, and remove the failing Lennox indoor and outdoor equipment.

Prepare the existing GSMS-installed outdoor wall bracket to accept the new condenser.

2. New Indoor & Outdoor Equipment

Indoor Air Handlers: Supply and install two (2) perfectly sized, high-efficiency wall-mounted ductless heads located in the Master Bedroom and the Great Room.

Outdoor Condenser: Su
This proposal outlines the complete replacement of your existing Lennox R-410A two-zone mini-split system. We will be upgrading the equipment serving your Master Bedroom and Great Room to ensure reliable, high-efficiency cooling and supplemental heating.

To provide the most cost-effective and clean installation possible, we will be reusing the Fortress line hide and heavy-duty exterior wall bracket that our team previously installed, while completely replacing all the internal working components (copper, wiring, and equipment).

Scope of Work

1. Equipment Removal & Preparation

Safely disconnect, recover existing refrigerant, and remove the failing Lennox indoor and outdoor equipment.

Prepare the existing GSMS-installed outdoor wall bracket to accept the new condenser.

2. New Indoor & Outdoor Equipment

Indoor Air Handlers: Supply and install two (2) perfectly sized, high-efficiency wall-mounted ductless heads located in the Master Bedroom and the Great Room.

Outdoor Condenser: Su
Adam P.
Adam P. Checked in
This proposal outlines the complete replacement of your existing Lennox R-410A two-zone mini-split system. We will be upgrading the equipment serving your Master Bedroom and Great Room to ensure reliable, high-efficiency cooling and supplemental heating. To provide the most cost-effective and clean installation possible, we will be reusing the Fortress line hide and heavy-duty exterior wall bracket that our team previously installed, while completely replacing all the internal working components (copper, wiring, and equipment). Scope of Work 1. Equipment Removal & Preparation Safely disconnect, recover existing refrigerant, and remove the failing Lennox indoor and outdoor equipment. Prepare the existing GSMS-installed outdoor wall bracket to accept the new condenser. 2. New Indoor & Outdoor Equipment Indoor Air Handlers: Supply and install two (2) perfectly sized, high-efficiency wall-mounted ductless heads located in the Master Bedroom and the Great Room. Outdoor Condenser: Su
Londonderry, NH 03053
Review
Excellent, prompt service
John - Hollis, NH 03049
Project Overview

Supply and install a multi-zone ductless heat pump system to serve both the Master Bedroom and the first-floor Family Room. This solution allows for independent temperature control in each space, providing high-efficiency cooling, dehumidification, and supplemental heating.

Scope of Work

1. Equipment Installation

Master Bedroom (Indoor Unit A): Install one (1) High-Wall Indoor Unit, positioned on the wall facing the backyard.

Family Room (Indoor Unit B): Install one (1) High-Wall Indoor Unit in the location of the existing in-wall A/C.

Outdoor Unit: Position the outdoor condenser on the ground level underneath the bay window.

Client Responsibilities: * Shrub Relocation: Client will need to relocate one shrub to provide clearance for the outdoor unit.

Carpentry: Client to have their carpenter remove the existing in-wall A/C unit and patch/finish the wall opening prior to our installation so the new indoor unit can be mounted seamlessly over that location.

2. Li
Project Overview

Supply and install a multi-zone ductless heat pump system to serve both the Master Bedroom and the first-floor Family Room. This solution allows for independent temperature control in each space, providing high-efficiency cooling, dehumidification, and supplemental heating.

Scope of Work

1. Equipment Installation

Master Bedroom (Indoor Unit A): Install one (1) High-Wall Indoor Unit, positioned on the wall facing the backyard.

Family Room (Indoor Unit B): Install one (1) High-Wall Indoor Unit in the location of the existing in-wall A/C.

Outdoor Unit: Position the outdoor condenser on the ground level underneath the bay window.

Client Responsibilities: * Shrub Relocation: Client will need to relocate one shrub to provide clearance for the outdoor unit.

Carpentry: Client to have their carpenter remove the existing in-wall A/C unit and patch/finish the wall opening prior to our installation so the new indoor unit can be mounted seamlessly over that location.

2. Li
Adam P.
Adam P. Checked in
Project Overview Supply and install a multi-zone ductless heat pump system to serve both the Master Bedroom and the first-floor Family Room. This solution allows for independent temperature control in each space, providing high-efficiency cooling, dehumidification, and supplemental heating. Scope of Work 1. Equipment Installation Master Bedroom (Indoor Unit A): Install one (1) High-Wall Indoor Unit, positioned on the wall facing the backyard. Family Room (Indoor Unit B): Install one (1) High-Wall Indoor Unit in the location of the existing in-wall A/C. Outdoor Unit: Position the outdoor condenser on the ground level underneath the bay window. Client Responsibilities: * Shrub Relocation: Client will need to relocate one shrub to provide clearance for the outdoor unit. Carpentry: Client to have their carpenter remove the existing in-wall A/C unit and patch/finish the wall opening prior to our installation so the new indoor unit can be mounted seamlessly over that location. 2. Li
Hollis, NH 03049
Replacement of the existing tank-style water heater. Install a 40-gallon indirect tank as a new zone off the existing boiler. The boiler was prepiped and set up to allow for this plan in the future.
Replacement of the existing tank-style water heater. Install a 40-gallon indirect tank as a new zone off the existing boiler. The boiler was prepiped and set up to allow for this plan in the future.
Adam P.
Adam P. Checked in
Replacement of the existing tank-style water heater. Install a 40-gallon indirect tank as a new zone off the existing boiler. The boiler was prepiped and set up to allow for this plan in the future.
Manchester, NH 03102
Replacement of the existing hydronic air handler and central air system with a new high-efficiency hybrid heat pump system.

A new First Co hydronic air handler will be installed. This unit features a variable-speed motor for quiet and efficient operation, and it has a built-in hydronic coil for heating. We will install a new return air base with a new air filtration system. The new coil will be re-connected to the existing oil boiler zone, just as the previous system was. The existing ductwork connections will be remade to the new system, and both returns will be reconnected.

A new lineset will be run from the outdoor unit to the interior. If a new line cannot be run, we will purge and clean the existing lineset using our cleaning agent.

Outside, a new heat pump unit will be installed on the existing concrete pad. The new unit will be elevated on "footies" to assist with defrost cycles and prevent freezing. A new Lennox s40 smart Wi-Fi thermostat will control the system, with a bala
Replacement of the existing hydronic air handler and central air system with a new high-efficiency hybrid heat pump system.

A new First Co hydronic air handler will be installed. This unit features a variable-speed motor for quiet and efficient operation, and it has a built-in hydronic coil for heating. We will install a new return air base with a new air filtration system. The new coil will be re-connected to the existing oil boiler zone, just as the previous system was. The existing ductwork connections will be remade to the new system, and both returns will be reconnected.

A new lineset will be run from the outdoor unit to the interior. If a new line cannot be run, we will purge and clean the existing lineset using our cleaning agent.

Outside, a new heat pump unit will be installed on the existing concrete pad. The new unit will be elevated on "footies" to assist with defrost cycles and prevent freezing. A new Lennox s40 smart Wi-Fi thermostat will control the system, with a bala
Adam P.
Adam P. Checked in
Replacement of the existing hydronic air handler and central air system with a new high-efficiency hybrid heat pump system. A new First Co hydronic air handler will be installed. This unit features a variable-speed motor for quiet and efficient operation, and it has a built-in hydronic coil for heating. We will install a new return air base with a new air filtration system. The new coil will be re-connected to the existing oil boiler zone, just as the previous system was. The existing ductwork connections will be remade to the new system, and both returns will be reconnected. A new lineset will be run from the outdoor unit to the interior. If a new line cannot be run, we will purge and clean the existing lineset using our cleaning agent. Outside, a new heat pump unit will be installed on the existing concrete pad. The new unit will be elevated on "footies" to assist with defrost cycles and prevent freezing. A new Lennox s40 smart Wi-Fi thermostat will control the system, with a bala
Bedford, NH 03110
Installed Lennox heat pump
Installed Lennox heat pump
Adam P.
Adam P. Checked in
Installed Lennox heat pump
Bedford, NH 03110
Windham, NH - Project Overview

During our recent service visit, Jack, noted significant scale buildup and active corrosion on several internal valves and fittings within your 11-year-old Rinnai tankless water heater. Given the age of the unit (originally installed during the home's construction) and the cost of rebuilding these internal components, we strongly recommend proactively replacing the unit. Upgrading now prevents a sudden failure and provides you with a brand-new system, full factory warranties, and renewed efficiency.

Scope of Work

1. Equipment Removal & Installation

Removal: Safely drain, disconnect, and remove the existing 11-year-old Rinnai tankless water heater.

Installation: Supply and mount a new, high-efficiency Rinnai Tankless Water Heater in the existing location.

Connections: Install new hot and cold water isolation valves (required for future maintenance and flushing) and reconnect to the existing gas and water lines.

2. Recirculation System

Integration: Your home is a
Adam P.
Adam P. Checked in
Project Overview During our recent service visit, Jack, noted significant scale buildup and active corrosion on several internal valves and fittings within your 11-year-old Rinnai tankless water heater. Given the age of the unit (originally installed during the home's construction) and the cost of rebuilding these internal components, we strongly recommend proactively replacing the unit. Upgrading now prevents a sudden failure and provides you with a brand-new system, full factory warranties, and renewed efficiency. Scope of Work 1. Equipment Removal & Installation Removal: Safely drain, disconnect, and remove the existing 11-year-old Rinnai tankless water heater. Installation: Supply and mount a new, high-efficiency Rinnai Tankless Water Heater in the existing location. Connections: Install new hot and cold water isolation valves (required for future maintenance and flushing) and reconnect to the existing gas and water lines. 2. Recirculation System Integration: Your home is a
Windham, NH 03087
Adam P.
Adam P. Checked in
Removed old boiler. Tightened tankless coil
Merrimack, NH 03054
Review
Adam & Quinn just left after finishing the installation of my new Lennox Air Conditioning unit. As always, they are very personable and professional. Adam explains everything to me before he leaves and I am very comfortable with my new system. I would not hesitate to recommend GSMS and have done so in the past.
Deb - Hooksett, NH 03106
We will replace the original system with a new high-efficiency Lennox system, upgrading from the existing 80% efficient furnace to a 90+% efficient model. The existing furnace vent will be capped off, and a new vent will be installed to exit through the side wall of the garage. This will be white PVC, which can be painted to match the exterior of the home. We can provide a photo of the proposed vent location for condo association approval if needed.

The new system will be installed in the same location, with any necessary modifications to ensure a proper fit. Outside, a new condensing unit will be installed. The existing lineset will be flushed and re-used due to the limited accessibility of the installation path. A final site visit will be needed to confirm the most appropriate location for the outdoor unit.

A new Wi-Fi thermostat will be installed, offering user-friendly control at home and the ability to monitor and adjust your system remotely while traveling.
We will replace the original system with a new high-efficiency Lennox system, upgrading from the existing 80% efficient furnace to a 90+% efficient model. The existing furnace vent will be capped off, and a new vent will be installed to exit through the side wall of the garage. This will be white PVC, which can be painted to match the exterior of the home. We can provide a photo of the proposed vent location for condo association approval if needed.

The new system will be installed in the same location, with any necessary modifications to ensure a proper fit. Outside, a new condensing unit will be installed. The existing lineset will be flushed and re-used due to the limited accessibility of the installation path. A final site visit will be needed to confirm the most appropriate location for the outdoor unit.

A new Wi-Fi thermostat will be installed, offering user-friendly control at home and the ability to monitor and adjust your system remotely while traveling.
Adam P.
Adam P. Checked in
We will replace the original system with a new high-efficiency Lennox system, upgrading from the existing 80% efficient furnace to a 90+% efficient model. The existing furnace vent will be capped off, and a new vent will be installed to exit through the side wall of the garage. This will be white PVC, which can be painted to match the exterior of the home. We can provide a photo of the proposed vent location for condo association approval if needed. The new system will be installed in the same location, with any necessary modifications to ensure a proper fit. Outside, a new condensing unit will be installed. The existing lineset will be flushed and re-used due to the limited accessibility of the installation path. A final site visit will be needed to confirm the most appropriate location for the outdoor unit. A new Wi-Fi thermostat will be installed, offering user-friendly control at home and the ability to monitor and adjust your system remotely while traveling.
Hooksett, NH 03106
Project Overview

Supply and install a new Lennox Signature Series (SLP99V) Variable Speed Gas Furnace. This system offers the highest level of precision, modulating its output in 1% increments to maintain exact temperatures while integrating seamlessly with the existing Rheem AC and new Lennox S40 smart controls.

Scope of Work

1. Equipment Installation & Adaptation

Furnace: Install Lennox SLP99V Variable Speed Gas Furnace.

Coil Adaptation: Fabricate custom sheet metal transitions to mate the new furnace width and height to the existing Rheem evaporative coil (installed 2020).

Return Drop: Modify the existing return drop to accommodate the new filtration cabinet.

2. Venting & Drainage

Venting Upgrade: Disconnect existing 3" venting. Install new 2" PVC intake and exhaust piping, utilizing the existing path to the exterior termination point.

Condensate Management: Eliminate the existing floor drain setup. Install a new condensate pump and route vinyl tubing to discharge water to
Project Overview

Supply and install a new Lennox Signature Series (SLP99V) Variable Speed Gas Furnace. This system offers the highest level of precision, modulating its output in 1% increments to maintain exact temperatures while integrating seamlessly with the existing Rheem AC and new Lennox S40 smart controls.

Scope of Work

1. Equipment Installation & Adaptation

Furnace: Install Lennox SLP99V Variable Speed Gas Furnace.

Coil Adaptation: Fabricate custom sheet metal transitions to mate the new furnace width and height to the existing Rheem evaporative coil (installed 2020).

Return Drop: Modify the existing return drop to accommodate the new filtration cabinet.

2. Venting & Drainage

Venting Upgrade: Disconnect existing 3" venting. Install new 2" PVC intake and exhaust piping, utilizing the existing path to the exterior termination point.

Condensate Management: Eliminate the existing floor drain setup. Install a new condensate pump and route vinyl tubing to discharge water to
Adam P.
Adam P. Checked in
Project Overview Supply and install a new Lennox Signature Series (SLP99V) Variable Speed Gas Furnace. This system offers the highest level of precision, modulating its output in 1% increments to maintain exact temperatures while integrating seamlessly with the existing Rheem AC and new Lennox S40 smart controls. Scope of Work 1. Equipment Installation & Adaptation Furnace: Install Lennox SLP99V Variable Speed Gas Furnace. Coil Adaptation: Fabricate custom sheet metal transitions to mate the new furnace width and height to the existing Rheem evaporative coil (installed 2020). Return Drop: Modify the existing return drop to accommodate the new filtration cabinet. 2. Venting & Drainage Venting Upgrade: Disconnect existing 3" venting. Install new 2" PVC intake and exhaust piping, utilizing the existing path to the exterior termination point. Condensate Management: Eliminate the existing floor drain setup. Install a new condensate pump and route vinyl tubing to discharge water to
Sandown, NH 03873
Replaced indirect temp sensor.
Replaced indirect temp sensor.
Adam P.
Adam P. Checked in
Replaced indirect temp sensor.
Barrington, NH 03825
Project Scope:
We will install a complete makeup air solution to balance the new high-CFM kitchen hood. Following approval from the Mechanical Inspector, this system will be installed in the basement and integrated directly into the existing HVAC return ductwork, eliminating the need for a separate floor register in the kitchen.

Equipment & Operation:
We will install the Fantech MUAS 750 Makeup Air System.

Capacity: This unit provides up to 750 CFM of fresh air to match the Thermador Hood exhaust rate.

Intelligent Modulation: The unit utilizes a pressure transducer to sense the hood speed and automatically modulates the intake fan. This ensures we only bring in the exact amount of air needed to balance the home pressure.

Mandatory Pre-Conditioning (Electric Heater):
Per the Mechanical Inspector's requirement for injecting outside air into a forced air heating system, we will install an Electric Duct Heater inline with the makeup air unit.

Function: This heater will temper the inco
Project Scope:
We will install a complete makeup air solution to balance the new high-CFM kitchen hood. Following approval from the Mechanical Inspector, this system will be installed in the basement and integrated directly into the existing HVAC return ductwork, eliminating the need for a separate floor register in the kitchen.

Equipment & Operation:
We will install the Fantech MUAS 750 Makeup Air System.

Capacity: This unit provides up to 750 CFM of fresh air to match the Thermador Hood exhaust rate.

Intelligent Modulation: The unit utilizes a pressure transducer to sense the hood speed and automatically modulates the intake fan. This ensures we only bring in the exact amount of air needed to balance the home pressure.

Mandatory Pre-Conditioning (Electric Heater):
Per the Mechanical Inspector's requirement for injecting outside air into a forced air heating system, we will install an Electric Duct Heater inline with the makeup air unit.

Function: This heater will temper the inco
Adam P.
Adam P. Checked in
Project Scope: We will install a complete makeup air solution to balance the new high-CFM kitchen hood. Following approval from the Mechanical Inspector, this system will be installed in the basement and integrated directly into the existing HVAC return ductwork, eliminating the need for a separate floor register in the kitchen. Equipment & Operation: We will install the Fantech MUAS 750 Makeup Air System. Capacity: This unit provides up to 750 CFM of fresh air to match the Thermador Hood exhaust rate. Intelligent Modulation: The unit utilizes a pressure transducer to sense the hood speed and automatically modulates the intake fan. This ensures we only bring in the exact amount of air needed to balance the home pressure. Mandatory Pre-Conditioning (Electric Heater): Per the Mechanical Inspector's requirement for injecting outside air into a forced air heating system, we will install an Electric Duct Heater inline with the makeup air unit. Function: This heater will temper the inco
Manchester, NH 03104
Manchester, NH - Found pressure switch stuck closed. Replaced with universal
Adam P.
Adam P. Checked in
Found pressure switch stuck closed. Replaced with universal
Manchester, NH 03109
Project Overview

Due to the failure of the existing indirect coil and the age of the equipment, we propose replacing the entire system with a new Advantage Oil Boiler. This installation includes a new 40-gallon indirect water heater to handle the home's domestic hot water needs. The system will be piped for three distinct zones: First Floor, Second Floor, and the Indirect Tank.


Scope of Work

1. Boiler & Piping Installation

Boiler: Install one (1) Advantage Oil Boiler.

Near-Boiler Piping: Remove all old near-boiler piping and replace with new copper piping.

Circulation: Install three (3) new dedicated circulator pumps to control the First Floor, Second Floor, and Indirect Tank zones.


2. Domestic Hot Water

Install a new 40-Gallon Indirect Water Heater. This tank is heated by the boiler, providing ample hot water recovery for the home.


3. Venting & Fuel

Venting: The new boiler will be connected to the existing power vent system. Our Service Specialists will verify the power v
Project Overview

Due to the failure of the existing indirect coil and the age of the equipment, we propose replacing the entire system with a new Advantage Oil Boiler. This installation includes a new 40-gallon indirect water heater to handle the home's domestic hot water needs. The system will be piped for three distinct zones: First Floor, Second Floor, and the Indirect Tank.


Scope of Work

1. Boiler & Piping Installation

Boiler: Install one (1) Advantage Oil Boiler.

Near-Boiler Piping: Remove all old near-boiler piping and replace with new copper piping.

Circulation: Install three (3) new dedicated circulator pumps to control the First Floor, Second Floor, and Indirect Tank zones.


2. Domestic Hot Water

Install a new 40-Gallon Indirect Water Heater. This tank is heated by the boiler, providing ample hot water recovery for the home.


3. Venting & Fuel

Venting: The new boiler will be connected to the existing power vent system. Our Service Specialists will verify the power v
Adam P.
Adam P. Checked in
Project Overview Due to the failure of the existing indirect coil and the age of the equipment, we propose replacing the entire system with a new Advantage Oil Boiler. This installation includes a new 40-gallon indirect water heater to handle the home's domestic hot water needs. The system will be piped for three distinct zones: First Floor, Second Floor, and the Indirect Tank. Scope of Work 1. Boiler & Piping Installation Boiler: Install one (1) Advantage Oil Boiler. Near-Boiler Piping: Remove all old near-boiler piping and replace with new copper piping. Circulation: Install three (3) new dedicated circulator pumps to control the First Floor, Second Floor, and Indirect Tank zones. 2. Domestic Hot Water Install a new 40-Gallon Indirect Water Heater. This tank is heated by the boiler, providing ample hot water recovery for the home. 3. Venting & Fuel Venting: The new boiler will be connected to the existing power vent system. Our Service Specialists will verify the power v
Chester, NH 03036
Adam P.
Adam P. Checked in
Customer had no heat. Found blown 1 amp fuse in zone panel
Merrimack, NH 03054
Installation of a multi-zone mini-split system to provide the main house with priority cooling.

Note on Heating: This system is sized and designed primarily for the cooling load. While it will provide supplemental heating during shoulder seasons, it is not designed to provide the total heating load for the home during winter.

System Overview
A multi-zone outdoor unit will be placed in a central location on the back side of the home. This system is sized to handle the current load with enough remaining capacity to add an additional 6,000 BTU head for the second bedroom in the future (a great selling feature).

Indoor Unit Locations & Routing
TV Room / Kitchen: The indoor unit will be installed to the left of the slider. The lineset will run down through the deck into the unfinished basement, run across, and penetrate out to the outdoor unit. This ensures a clean finish and allows a future contractor to easily refinish the deck around the lineset.

Great Room / Living Area: The unit wi
Installation of a multi-zone mini-split system to provide the main house with priority cooling.

Note on Heating: This system is sized and designed primarily for the cooling load. While it will provide supplemental heating during shoulder seasons, it is not designed to provide the total heating load for the home during winter.

System Overview
A multi-zone outdoor unit will be placed in a central location on the back side of the home. This system is sized to handle the current load with enough remaining capacity to add an additional 6,000 BTU head for the second bedroom in the future (a great selling feature).

Indoor Unit Locations & Routing
TV Room / Kitchen: The indoor unit will be installed to the left of the slider. The lineset will run down through the deck into the unfinished basement, run across, and penetrate out to the outdoor unit. This ensures a clean finish and allows a future contractor to easily refinish the deck around the lineset.

Great Room / Living Area: The unit wi
Adam P.
Adam P. Checked in
Installation of a multi-zone mini-split system to provide the main house with priority cooling. Note on Heating: This system is sized and designed primarily for the cooling load. While it will provide supplemental heating during shoulder seasons, it is not designed to provide the total heating load for the home during winter. System Overview A multi-zone outdoor unit will be placed in a central location on the back side of the home. This system is sized to handle the current load with enough remaining capacity to add an additional 6,000 BTU head for the second bedroom in the future (a great selling feature). Indoor Unit Locations & Routing TV Room / Kitchen: The indoor unit will be installed to the left of the slider. The lineset will run down through the deck into the unfinished basement, run across, and penetrate out to the outdoor unit. This ensures a clean finish and allows a future contractor to easily refinish the deck around the lineset. Great Room / Living Area: The unit wi
Hampstead, NH 03841
Adam P.
Adam P. Checked in
Install hose bib
Manchester, NH 03109
Review
Excellent!!!
Kathleen - Merrimack, NH 03054
Review
Arrived on time, organized equipment. Friendly, answered all my “many questions”. Adam made sure all the equipment was in working order. Excellent service.
Kathleen - Merrimack, NH 03054
Review
Working with GSMS was a fantastic experience. There was attention to detail from the estimate to the clean up at the end of the project. Especially during the planning process, Zak helped me evaluate different options, quickly readjusted as I changed my mind... without ANY pressure! Superior, prompt communication during the whole (and post) process.
Ethel - Londonderry, NH 03053
Review
Excellent service
Paul - Nashua, NH 03062
Review
Excellent Service
26 - Manchester, NH 03102
Review
Everything about my experience has been great. I always appreciate a company who doesn’t bat an eye at my many questions. Fantastic customer service all around and a great install experience. Adam was fantastic!
Lauren - Durham, NH 03824
Review
Adam is amazing! Friendly, professional, competent and clearly explains technical issues.
Robert Fielding - Concord, NH 03301
Review
Excellent in all areas of service. Punctual, courteous, kept us well informed of service progress. Upon completion of the furnace installation Adam explained all features of the new system , and addressed questions . The above statement can be said of all GSMS employees as we have used them over the years for several different systems installation. Excellent in all areas.
Bob M - Merrimack, NH 03054
Review
The hot water tank leaked resulting in lots of water in the basement. Adam removed the old tank and installed a new one. The install looks great and got hot water back.
Lori - Nashua, NH 03060
Review
Adam let me know 1/2 in advance of arrival. Showed up on time. Explained in simple to understand terminology what was being done and any system restrictions during the install. He completely answered any follow-up questions I had. He was courteous to my wife with any questions she had. The install results are professional and immaculate. The entire staff at GSMS was courteous and highly professional. I highly recommend GSMS and Adam for any HVAC work.
Donald - Barrington, NH 03825
Review
GSMS did an excellent job with our mini split! We are very happy with their work!
Bernadette - Newmarket, NH 03857
Review
Adam and his associates did a wonderful job . They were knowledgeable, professional and extremely efficient in completing the work . Adam took the time to review how the system operates making reference to the Owners Manual . He was sure to recommend calling if I had any follow up questions. I will definitely recommend your Company based on the work that Adam and the others performed.
Bill - Weare, NH 03281
Review
Very professional in all respects.
BJ - Merrimack, NH 03054
Trusted Quality & Service