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

Litchfield, NH

Your Local Plumbing & HVAC Experts in Litchfield, NH

Homeowners in Litchfield, NH, count on GSMS for dependable plumbing, heating, and cooling services. As a family-owned company, we bring decades of experience and a neighborly approach to every service call. Whether you’re looking to upgrade to a ductless system, need a new water heater, or have a plumbing emergency, our licensed team is here to make your home comfortable again.

Schedule your service today by calling 603-424-8258 or request an appointment online.

Ductless Mini-Splits: The Smart Choice for Litchfield Homes

As a Mitsubishi Electric dealer, we specialize in high-efficiency ductless mini-split systems designed for New England homes.

If you’re in Litchfield and looking for a modern, efficient alternative to traditional systems, our team can recommend the ideal Mitsubishi ductless solution for your space.

Plumbing Services for Litchfield, NH

Plumbing problems can disrupt daily life quickly. That’s why GSMS offers full-service plumbing solutions designed to keep your home’s water flowing smoothly and reliably.

Water Heater Repair & Installation

Our plumbers service both traditional and tankless water heaters, restoring hot water fast when you need it.

Whole-Home Water Filtration

Protect your plumbing and enjoy better-tasting water with custom water filtration and reverse osmosis systems built for your home.

Plumbing Repairs & Installations

From leaky faucets to broken fixtures, our licensed plumbers provide reliable solutions for any issue.

Heating & Cooling Services in Litchfield

Keeping your home comfortable in New Hampshire’s changing seasons means having reliable heating and cooling systems. Our technicians are here to handle everything from urgent repairs to complete system replacements.

Furnace & Boiler Services

Stay warm in Litchfield winters with expert furnace and boiler repair, replacement, and maintenance.

Air Conditioning Repair & Installation

Beat the summer heat with AC repairs and replacements designed to keep your home cool and efficient.

Indoor Air Quality Solutions

From air purifiers to humidity control, we help you create a healthier home environment.

Why Litchfield Homeowners Choose GSMS for Home Comfort

As a family-owned business serving Southern New Hampshire, GSMS is trusted by homeowners throughout Litchfield, NH for honest, reliable service. Whether you’re near Campbell High School or along Albuquerque Avenue, our technicians know the unique needs of the community and deliver solutions that last.

When you need comfort restored fast or want to upgrade your home systems, turn to GSMS — the local team your neighbors trust. Call us today at 603-424-8258 or request service online to get started.

Recent Jobs and Reviews in , NH

At a glance

GSMS Air•Heating•Plumbing has completed 25 jobs in NH in September 2026.

The 25 customer reviews shown here average 5.0 out of 5.

The most recent job was on September 25, 2026.

Recent work covers Bedford, Gilmanton, Londonderry, Nashua and Amherst.

Job Locations and Reviews

Review
Always wonderful with Quentin
Bonnie - Bedford, NH 03110
Qwentin G.
Qwentin G. Checked in
Needed to connect W wire.
Londonderry, NH 03053
Review
Overall it was a great experience. From getting the appointment to completion of maintenance, all was smooth.
Ali - Bedford, NH 03110
Scope of Work:
Upgrade to a High-Efficiency US Boiler Alta Series system, offering superior energy savings, quiet operation, and modern sealed-combustion technology.

Heating & Hot Water:

Boiler Installation: The new high-efficiency wall-hung unit will be installed in the basement, on the wall in the vacinity of the old boiler.

Domestic Hot Water: This boiler is a combi model so it will act as a tankless water heater, providing domestic hot water for the home. Expect an additional 30-second delay in heating.

Condensate Management: As a high-efficiency unit, this system produces condensate (water). We will install a condensate pump to route this moisture automatically to the available basement drain.

Venting (Sidewall):

Chimney Retirement: The existing chimney will be capped off and no longer used.

New Intake/Exhaust: We will install new PVC fresh air intake and Centrotherm exhaust piping. These lines will route through the unfinished basement ceiling and penetrate the exterior wa
Scope of Work:
Upgrade to a High-Efficiency US Boiler Alta Series system, offering superior energy savings, quiet operation, and modern sealed-combustion technology.

Heating & Hot Water:

Boiler Installation: The new high-efficiency wall-hung unit will be installed in the basement, on the wall in the vacinity of the old boiler.

Domestic Hot Water: This boiler is a combi model so it will act as a tankless water heater, providing domestic hot water for the home. Expect an additional 30-second delay in heating.

Condensate Management: As a high-efficiency unit, this system produces condensate (water). We will install a condensate pump to route this moisture automatically to the available basement drain.

Venting (Sidewall):

Chimney Retirement: The existing chimney will be capped off and no longer used.

New Intake/Exhaust: We will install new PVC fresh air intake and Centrotherm exhaust piping. These lines will route through the unfinished basement ceiling and penetrate the exterior wa
Mark D.
Mark D. Checked in
Scope of Work: Upgrade to a High-Efficiency US Boiler Alta Series system, offering superior energy savings, quiet operation, and modern sealed-combustion technology. Heating & Hot Water: Boiler Installation: The new high-efficiency wall-hung unit will be installed in the basement, on the wall in the vacinity of the old boiler. Domestic Hot Water: This boiler is a combi model so it will act as a tankless water heater, providing domestic hot water for the home. Expect an additional 30-second delay in heating. Condensate Management: As a high-efficiency unit, this system produces condensate (water). We will install a condensate pump to route this moisture automatically to the available basement drain. Venting (Sidewall): Chimney Retirement: The existing chimney will be capped off and no longer used. New Intake/Exhaust: We will install new PVC fresh air intake and Centrotherm exhaust piping. These lines will route through the unfinished basement ceiling and penetrate the exterior wa
Manchester, NH 03102
Completed both furnace maintenances today. Everything went great! Please see the attached form.
Completed both furnace maintenances today. Everything went great! Please see the attached form.
Qwentin G.
Qwentin G. Checked in
Completed both furnace maintenances today. Everything went great! Please see the attached form.
Bedford, NH 03110
Completed both gas furnace maintenances. I replaced the filter on the furnace downstairs and replaced both humidifier pads. Everything went great today! Please see the attached form.
Completed both gas furnace maintenances. I replaced the filter on the furnace downstairs and replaced both humidifier pads. Everything went great today! Please see the attached form.
Qwentin G.
Qwentin G. Checked in
Completed both gas furnace maintenances. I replaced the filter on the furnace downstairs and replaced both humidifier pads. Everything went great today! Please see the attached form.
Bedford, NH 03110
Review
Great team of technicians keeping my system running both summer and winter
John - Bedford, NH 03110
Completed the furnace maintenance today. Everything went great. The only thing that I noticed was the collector box is starting to leak and the flue tee is really crusty. I'll send over an estimate for those repairs. Please see the attached form.
Completed the furnace maintenance today. Everything went great. The only thing that I noticed was the collector box is starting to leak and the flue tee is really crusty. I'll send over an estimate for those repairs. Please see the attached form.
Qwentin G.
Qwentin G. Checked in
Completed the furnace maintenance today. Everything went great. The only thing that I noticed was the collector box is starting to leak and the flue tee is really crusty. I'll send over an estimate for those repairs. Please see the attached form.
Bedford, NH 03110
Jack D.
Jack D. Checked in
Loose wire connection in pump.
Bow, NH 03304
Checked incoming and outgoing gas pressures and everything looked good. Performed a combustion analyzer test and all my readings were good as well. I noticed that the low pressure switch is faulty and was never hooked up into the circuit from when the unit was installed. We will send over an estimate to replace the low pressure switch.
Checked incoming and outgoing gas pressures and everything looked good. Performed a combustion analyzer test and all my readings were good as well. I noticed that the low pressure switch is faulty and was never hooked up into the circuit from when the unit was installed. We will send over an estimate to replace the low pressure switch.
Qwentin G.
Qwentin G. Checked in
Checked incoming and outgoing gas pressures and everything looked good. Performed a combustion analyzer test and all my readings were good as well. I noticed that the low pressure switch is faulty and was never hooked up into the circuit from when the unit was installed. We will send over an estimate to replace the low pressure switch.
Auburn, NH 03032
Review
Excellent service and very knowledgeable technician.
Michael - Amherst, NH 03031
Jack D.
Jack D. Checked in
Gas leak found at oven gas connector. Replace with new appliance connector.
Newbury, NH 03255
Replaced the heat exchanger. I checked incoming and outgoing gas pressure and that was according to manufacturing specifications. I performed a combustion analyzer test and the unit was running great. Lastly I used my CO detector and went around all the sealed spots and there was no CO detected.
Replaced the heat exchanger. I checked incoming and outgoing gas pressure and that was according to manufacturing specifications. I performed a combustion analyzer test and the unit was running great. Lastly I used my CO detector and went around all the sealed spots and there was no CO detected.
Qwentin G.
Qwentin G. Checked in
Replaced the heat exchanger. I checked incoming and outgoing gas pressure and that was according to manufacturing specifications. I performed a combustion analyzer test and the unit was running great. Lastly I used my CO detector and went around all the sealed spots and there was no CO detected.
Londonderry, NH 03053
Boiler PM
Boiler PM
Jack D.
Jack D. Checked in
Boiler PM
Madbury, NH 03823
Jack D.
Jack D. Checked in
Oil Burner Maintenance.
Bedford, NH 03110
Remove toilet and reset
Remove toilet and reset
Mark D.
Mark D. Checked in
Remove toilet and reset
Amherst, NH 03031
Bow, NH - I found the boiler pump to not be working due to air being stuck in the system. I purged the zones out and fixed a loose connection on the boiler pump. I also fixed the exposed wiring on the HW tank pump. I recommend replacing the boiler pump with a more reliable and robust pump. We have sent an estimate for that replacement. Thank you.
Jack D.
Jack D. Checked in
I found the boiler pump to not be working due to air being stuck in the system. I purged the zones out and fixed a loose connection on the boiler pump. I also fixed the exposed wiring on the HW tank pump. I recommend replacing the boiler pump with a more reliable and robust pump. We have sent an estimate for that replacement. Thank you.
Bow, NH 03304
Review
Great service and communication!
Steven - Hollis, NH 03049
Completed the oil boiler maintenance today. Everything went great. Please see the attached form. I also replaced the air vent that had failed.
Completed the oil boiler maintenance today. Everything went great. Please see the attached form. I also replaced the air vent that had failed.
Qwentin G.
Qwentin G. Checked in
Completed the oil boiler maintenance today. Everything went great. Please see the attached form. I also replaced the air vent that had failed.
Amherst, NH 03031
Review
Great service from start to beginning. Replaced my 35 year old System 2000 with the new version. Very impressed with the quality of work. Will definitely be using them from now on. Highly recommend! GREAT COMPANY.
Anna - Greenland, NH 03840
This proposal outlines the direct replacement of your aging Energy Kinetics EK-1 system. Because you already know and love the efficiency of the System 2000, we will be upgrading you to the modern equivalent: the brand-new Energy Kinetics EK-1 "Frontier" boiler.

Additionally, we noted that your current hot water storage tank was replaced back in 2021. Because these tanks typically carry a 6-year warranty, it is quickly approaching the end of its guaranteed lifespan. Instead of waiting for it to fail a few years down the road, we highly recommend proactively replacing it now alongside the boiler. This ensures your entire mechanical room is 100% brand new, giving you total peace of mind and zero worries for years to come.

Scope of Work

1. High-Efficiency Boiler Upgrade

The Boiler: We will safely remove your old equipment and install the new Energy Kinetics EK-1 Frontier boiler in the exact same footprint.

Whisper-Quiet Operation: The new Frontier model features a specialized "fresh
This proposal outlines the direct replacement of your aging Energy Kinetics EK-1 system. Because you already know and love the efficiency of the System 2000, we will be upgrading you to the modern equivalent: the brand-new Energy Kinetics EK-1 "Frontier" boiler.

Additionally, we noted that your current hot water storage tank was replaced back in 2021. Because these tanks typically carry a 6-year warranty, it is quickly approaching the end of its guaranteed lifespan. Instead of waiting for it to fail a few years down the road, we highly recommend proactively replacing it now alongside the boiler. This ensures your entire mechanical room is 100% brand new, giving you total peace of mind and zero worries for years to come.

Scope of Work

1. High-Efficiency Boiler Upgrade

The Boiler: We will safely remove your old equipment and install the new Energy Kinetics EK-1 Frontier boiler in the exact same footprint.

Whisper-Quiet Operation: The new Frontier model features a specialized "fresh
Adam P.
Adam P. Checked in
This proposal outlines the direct replacement of your aging Energy Kinetics EK-1 system. Because you already know and love the efficiency of the System 2000, we will be upgrading you to the modern equivalent: the brand-new Energy Kinetics EK-1 "Frontier" boiler. Additionally, we noted that your current hot water storage tank was replaced back in 2021. Because these tanks typically carry a 6-year warranty, it is quickly approaching the end of its guaranteed lifespan. Instead of waiting for it to fail a few years down the road, we highly recommend proactively replacing it now alongside the boiler. This ensures your entire mechanical room is 100% brand new, giving you total peace of mind and zero worries for years to come. Scope of Work 1. High-Efficiency Boiler Upgrade The Boiler: We will safely remove your old equipment and install the new Energy Kinetics EK-1 Frontier boiler in the exact same footprint. Whisper-Quiet Operation: The new Frontier model features a specialized "fresh
Greenland, NH 03840
Replace tubspout that had a faulty diverter. Seal around fixtures with sealant. Complete a furnace maintenance. The blower motor was stuck on because of a faulty control board. I located one and replaced it today. Thank you!
Replace tubspout that had a faulty diverter. Seal around fixtures with sealant. Complete a furnace maintenance. The blower motor was stuck on because of a faulty control board. I located one and replaced it today. Thank you!
Jack D.
Jack D. Checked in
Replace tubspout that had a faulty diverter. Seal around fixtures with sealant. Complete a furnace maintenance. The blower motor was stuck on because of a faulty control board. I located one and replaced it today. Thank you!
Hooksett, NH 03106
Completed the oil boiler maintenance. Everything went great. Please see the attached form.
Completed the oil boiler maintenance. Everything went great. Please see the attached form.
Qwentin G.
Qwentin G. Checked in
Completed the oil boiler maintenance. Everything went great. Please see the attached form.
Hollis, NH 03049
Review
Jack was knowledgeable and personable
Janeen - Londonderry, NH 03053
Qwentin G.
Qwentin G. Checked in
Added in a leak stop valve on the client's water heater. Tested all operations and checked for leaks and everything was working great!
Newmarket, NH 03857
Completed the oil boiler maintenance. Everything went great. Please see the attached form.
Completed the oil boiler maintenance. Everything went great. Please see the attached form.
Qwentin G.
Qwentin G. Checked in
Completed the oil boiler maintenance. Everything went great. Please see the attached form.
Newmarket, NH 03857
Review
Excellent and professional service
Shawn - Gilmanton, NH 03237
Jack D.
Jack D. Checked in
Found minisplit system to be low on refrigerant. I went around and checked every connection with electronic detector and could not find anything. Confirmed with local distributor that this year of unit did have bad indoor coils. We will provide an estimate to replace them under warranty.
Gilmanton, NH 03237
Completed the furnace maintenance. Found that the incoming gas pressure was 19.31 inches water column which is way over the max pressure that the gas valve can handle. I red tagged the furnace since it has an open burner box. I adjusted the outside regulator to 11 inchs water column. I informed the client and he contacted the propane company and they are going to come out this week to take a look at the regulator, the gas valve on the furnace, water heater and gas fireplace.
Completed the furnace maintenance. Found that the incoming gas pressure was 19.31 inches water column which is way over the max pressure that the gas valve can handle. I red tagged the furnace since it has an open burner box. I adjusted the outside regulator to 11 inchs water column. I informed the client and he contacted the propane company and they are going to come out this week to take a look at the regulator, the gas valve on the furnace, water heater and gas fireplace.
Qwentin G.
Qwentin G. Checked in
Completed the furnace maintenance. Found that the incoming gas pressure was 19.31 inches water column which is way over the max pressure that the gas valve can handle. I red tagged the furnace since it has an open burner box. I adjusted the outside regulator to 11 inchs water column. I informed the client and he contacted the propane company and they are going to come out this week to take a look at the regulator, the gas valve on the furnace, water heater and gas fireplace.
Auburn, NH 03032
Adam P.
Adam P. Checked in
Our team undertook a comprehensive upgrade of your home's heating and cooling system. After a detailed load calculation, we identified significant inefficiencies in your current oil/wood furnace and outdated ductwork. To enhance comfort and performance, we removed the old "octopus-style" ductwork and installed a new, efficient "trunk and branch" design. Additionally, we replaced the bulky equipment with a high-efficiency Lennox Hybrid system, combining a gas furnace and an electric heat pump. This new system is more compact and offers superior, quiet operation.
Barrington, NH 03825
Jack D.
Jack D. Checked in
2 new bath exhauaat fan + light combo replacement. Replace straight stop valve under vanity.
Nashua, NH 03060
Review
Mark is careful, thorough, and has very helpful suggestions.
Sharon - Merrimack, NH 03054
Merrimack, NH - This proposal covers the complete removal of your existing standard bathtub and the professional installation of a premium Walk-In Therapy Tub. To ensure this new therapeutic tub fills quickly and operates flawlessly, we will be heavily upgrading the underlying plumbing to 3/4" lines and running new dedicated electrical circuits to power the jets and inline heater. We will also be coordinating with our trusted partner, Scott, to handle the final tile, drywall, and paint restoration once the plumbing installation is complete.

Scope of Work

1. Demolition & Area Preparation

Tear-Out: We will carefully disconnect and remove the existing bathtub and immediate wall surrounds.

Debris Removal: All old tub materials and job site demolition debris will be hauled away and properly disposed of.

Area Prep: We will prep the exposed floor and framing to securely accept the new, heavier walk-in tub unit.

2. Plumbing Rough-In & Upgrades

Water Line Upsizing: Walk-in tubs require high water volume
Mark D.
Mark D. Checked in
This proposal covers the complete removal of your existing standard bathtub and the professional installation of a premium Walk-In Therapy Tub. To ensure this new therapeutic tub fills quickly and operates flawlessly, we will be heavily upgrading the underlying plumbing to 3/4" lines and running new dedicated electrical circuits to power the jets and inline heater. We will also be coordinating with our trusted partner, Scott, to handle the final tile, drywall, and paint restoration once the plumbing installation is complete. Scope of Work 1. Demolition & Area Preparation Tear-Out: We will carefully disconnect and remove the existing bathtub and immediate wall surrounds. Debris Removal: All old tub materials and job site demolition debris will be hauled away and properly disposed of. Area Prep: We will prep the exposed floor and framing to securely accept the new, heavier walk-in tub unit. 2. Plumbing Rough-In & Upgrades Water Line Upsizing: Walk-in tubs require high water volume
Merrimack, NH 03054
Completed the furnace maintenances and the boiler. Everything went great. Please see the attached forms. We replaced the drain line and in the air gap fitting there is still a small drip. It's improved but keep a eye on it and we will be in touch with a better solution. We also changed the rinse cycle to 12:00 during the day.
Completed the furnace maintenances and the boiler. Everything went great. Please see the attached forms. We replaced the drain line and in the air gap fitting there is still a small drip. It's improved but keep a eye on it and we will be in touch with a better solution. We also changed the rinse cycle to 12:00 during the day.
Qwentin G.
Qwentin G. Checked in
Completed the furnace maintenances and the boiler. Everything went great. Please see the attached forms. We replaced the drain line and in the air gap fitting there is still a small drip. It's improved but keep a eye on it and we will be in touch with a better solution. We also changed the rinse cycle to 12:00 during the day.
Bedford, NH 03110
Review
Great service as always. Thank you so very much for squeezing us in! We are very grateful.
Ray & Di - Manchester, NH 03102
Review
Excellent service
Gary - Stratham, NH 03885
Review
Jack was very professional, courteous, personable and thorough. Definitely at the top of my list for any future work needed and routine maintenance.
Bob - Manchester, NH 03104
Review
Adam and his team were on time each day, courteous, willing and able to answer all our questions. The system was flawlessly installed and we are beyond happy!
John - Goffstown, NH 03045
Review
Excellent service and technical work
Phil - Windham, NH 03087
Review
Qwentin was knowledgeable, friendly, & got the job done quickly.
Kelly - Londonderry, NH 03053
Review
Excellent and professional
Shawn - Gilmanton, NH 03237
Review
Fast resolution
Eric - Exeter, NH 03833
Review
Excellent service, neat and professional
Shawn - Gilmanton, NH 03837
Review
As usual everyone from your company is great. Always the best service.
Scott - Merrimack, NH 03054
Review
Professional, knowledgeable and friendly.. Qwentin from GSMS did a great job with our annual maintenance.. Always uses show coverings, cleans up when he’s done- and tolerates our 100 pound Black Lab who insists on helping!
Mark - Bedford, NH 03110
Review
He was extremely polite and knowledgeable. Outstanding service.
Ryan - Lee, NH 03861
Review
Jack did a great job checking our mini split and explaining how it should operate. He took the time to answer all our questions.
Joe - Nashua, NH 03060
Review
Jack was thorough and answered all questions. He’ll be our requested service tech from now on
Len - Newmarket, NH 03857
Review
It is always great to see Jack! GSMS never disappoints.
Karen - Nashua, NH 03063
Review
Quentin was friendly, personable, knew his business, and professional. Answered all my questions. Made recommendations that made sense. Would use him and GSMS anytime
Dale - Nashua, NH 03062
Zak Downing

Zak Downing

Get to Know Zak Downing
Trusted Quality & Service