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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

Job Locations and Reviews

Completed the maintenance on all six gas boilers. Pulled all the burner tubes and cleaned them. Cleaned the pilot assembly as well. Gas sniffed all the pilot tube connections, and found no leaks. Tested incoming and outgoing gas pressure. Performed a combustion analyzer test that checks for CO, CO2 and oxygen levels.
Completed the maintenance on all six gas boilers. Pulled all the burner tubes and cleaned them. Cleaned the pilot assembly as well. Gas sniffed all the pilot tube connections, and found no leaks. Tested incoming and outgoing gas pressure. Performed a combustion analyzer test that checks for CO, CO2 and oxygen levels.
Jack D.
Jack D. Checked in
Completed the maintenance on all six gas boilers. Pulled all the burner tubes and cleaned them. Cleaned the pilot assembly as well. Gas sniffed all the pilot tube connections, and found no leaks. Tested incoming and outgoing gas pressure. Performed a combustion analyzer test that checks for CO, CO2 and oxygen levels.
Manchester, NH 03102
Jack D.
Jack D. Checked in
Furnace PM. Everything went great. No issues, thank you!
Manchester, NH 03102
Installation of a single-zone mini-split heat pump system to provide the basement with heating and cooling.

A wall-mounted indoor unit will be installed on the exterior basement wall. We will core through the concrete foundation to allow the lines and condensate to exit to the exterior of the home. The outdoor unit will be mounted to the foundation with a wall bracket mount.

All electrical work will be completed by the client's electrician. We request that the electrical circuit for the system has a dedicated surge protector or that the home has a whole-home surge protector.

Important Note: This is a low-temp unit, designed to provide highly efficient heating performance even in low outdoor temperatures.
Installation of a single-zone mini-split heat pump system to provide the basement with heating and cooling.

A wall-mounted indoor unit will be installed on the exterior basement wall. We will core through the concrete foundation to allow the lines and condensate to exit to the exterior of the home. The outdoor unit will be mounted to the foundation with a wall bracket mount.

All electrical work will be completed by the client's electrician. We request that the electrical circuit for the system has a dedicated surge protector or that the home has a whole-home surge protector.

Important Note: This is a low-temp unit, designed to provide highly efficient heating performance even in low outdoor temperatures.
Adam P.
Adam P. Checked in
Installation of a single-zone mini-split heat pump system to provide the basement with heating and cooling. A wall-mounted indoor unit will be installed on the exterior basement wall. We will core through the concrete foundation to allow the lines and condensate to exit to the exterior of the home. The outdoor unit will be mounted to the foundation with a wall bracket mount. All electrical work will be completed by the client's electrician. We request that the electrical circuit for the system has a dedicated surge protector or that the home has a whole-home surge protector. Important Note: This is a low-temp unit, designed to provide highly efficient heating performance even in low outdoor temperatures.
East Kingston, NH 03827
Jack D.
Jack D. Checked in
Heat in living room left on due to hallway stat being on when it is usually left off for cooling.
Londonderry, NH 03053
Did home club visit for gas furnace and boiler.Both check out fine.
Did home club visit for gas furnace and boiler.Both check out fine.
Mark D.
Mark D. Checked in
Did home club visit for gas furnace and boiler.Both check out fine.
Bedford, NH 03110
Jack D.
Jack D. Checked in
Today I analyzed the boiler in the home. I found the pump neutral wired to L1 on the zone board, I switched that. I noticed that all of the pumps are on the return side, there are no zone valves present. This is what is causing zones to heat up when they aren't supposed to. This is also causing the issue with the first floor heat not feeling as warm, especially the bathroom.
Manchester, NH 03102
Litchfield, NH - Completed the maintenance on the oil boiler. I replaced the oil filter, the pump strainer, the nozzle and the electrodes. I removed the flue pipe and brushed and vacuumed the heat exchanger. The 90° elbow and the reducer that sits in the chimney both broke so that had to be replaced. I ran the unit and performed a combustion analyzer test. This checks for CO, CO2 and oxygen levels and everything was running great. I also had zero smoke.
Qwentin G.
Qwentin G. Checked in
Completed the maintenance on the oil boiler. I replaced the oil filter, the pump strainer, the nozzle and the electrodes. I removed the flue pipe and brushed and vacuumed the heat exchanger. The 90° elbow and the reducer that sits in the chimney both broke so that had to be replaced. I ran the unit and performed a combustion analyzer test. This checks for CO, CO2 and oxygen levels and everything was running great. I also had zero smoke.
Litchfield, NH 03052
Adam P.
Adam P. Checked in
Installation of a single-zone mini-split system to provide cooling and heating to the new addition space. Finished space of 12' x 13'. Unit will be wall-mounted and the outdoor unit will be placed on the side of the addition. Lines will be encased in our CoverGuard product on the exterior. Scott Woodbury will provide electrician to install dedicated 240V circuit needed.
Nashua, NH 03062
Mark D.
Mark D. Checked in
Bad press coup
Nashua, NH 03062
Jack D.
Jack D. Checked in
Replacement of the existing touch-free toilet with our most popular toilet, the Cimarron.
Stratham, NH 03885
Mark D.
Mark D. Checked in
Replaced mixing valve
Bedford, NH 03110
Mark D.
Mark D. Checked in
Checked boiler ment inspector everything is fine
Nashua, NH 03060
Mark D.
Mark D. Checked in
Replaced shower cartilage
Barrington, NH 03825
Hudson, NH - Replace 2 - 3/4 female adapters solder. Checked for leaks and all set!
Jack D.
Jack D. Checked in
Replace 2 - 3/4 female adapters solder. Checked for leaks and all set!
Hudson, NH 03051
Completed the maintenance on all four gas boilers. On all of them I pulled out the burner tubes and cleaned them. I vacuumed out the burner box. I cleaned the flame sensors as well. Inspected all the boiler accessories. The only unit that I found any issues with was the boiler that serves 117 Main St. There is a leaking high vent and a leaking relief valve as well.
Completed the maintenance on all four gas boilers. On all of them I pulled out the burner tubes and cleaned them. I vacuumed out the burner box. I cleaned the flame sensors as well. Inspected all the boiler accessories. The only unit that I found any issues with was the boiler that serves 117 Main St. There is a leaking high vent and a leaking relief valve as well.
Qwentin G.
Qwentin G. Checked in
Completed the maintenance on all four gas boilers. On all of them I pulled out the burner tubes and cleaned them. I vacuumed out the burner box. I cleaned the flame sensors as well. Inspected all the boiler accessories. The only unit that I found any issues with was the boiler that serves 117 Main St. There is a leaking high vent and a leaking relief valve as well.
Nashua, NH 03060
Nashua, NH - Rinnai Tankless water heater maintenance as part of HomeClub! Thank you!
Jack D.
Jack D. Checked in
Rinnai Tankless water heater maintenance as part of HomeClub! Thank you!
Nashua, NH 03062
Mark D.
Mark D. Checked in
Did work from estimate
Barrington, NH 03825
Finish boiler maintenance agreement work.
Finish boiler maintenance agreement work.
Jack D.
Jack D. Checked in
Finish boiler maintenance agreement work.
Londonderry, NH 03053
Qwentin G.
Qwentin G. Checked in
I started off with pulling out all the air filters and cleaning them with soap and hot water. I rinsed all the indoor coils with coil cleaner and then rinsed with water. I cleaned the out side of the unit with a wet rag. I completed the ERV maintenance. I cleaned the filters with soap and hot water. I inspected all the components inside. I vacuumed out the core and the inside of the unit. I cleaned the inside of the unit with a wet rag as well.
Pelham, NH 03076
Completed gas piping to gas generator
Completed gas piping to gas generator
Adam P.
Adam P. Checked in
Completed gas piping to gas generator
Merrimack, NH 03054
Review
Service
Guimont - Manchester, NH 03103
Jack D.
Jack D. Checked in
Replace failed zone board with oem replacement. Test operations of each zone. Replace supply air sensor in RTU for the economizer control. Test operations. All set, thank you!
Nashua, NH 03062
Replacement of the existing gas furnace and central air unit with a new high-efficiency variable-speed system.

A new furnace will be installed with new 2" venting for fresh air and exhaust. The existing CSST gas line will be replaced with black iron piping running from the gas regulator to the new furnace. The return drop will be modified to allow for the installation of our AirBear filtration unit, and all other connections will be remade.

The new A/C unit will be placed in the same location, installed on a new gravel footing and a composite unit pad, with a new disconnect and updated electrical connections. The entire system operation will be controlled by a new Lennox S40 smart thermostat.
Replacement of the existing gas furnace and central air unit with a new high-efficiency variable-speed system.

A new furnace will be installed with new 2" venting for fresh air and exhaust. The existing CSST gas line will be replaced with black iron piping running from the gas regulator to the new furnace. The return drop will be modified to allow for the installation of our AirBear filtration unit, and all other connections will be remade.

The new A/C unit will be placed in the same location, installed on a new gravel footing and a composite unit pad, with a new disconnect and updated electrical connections. The entire system operation will be controlled by a new Lennox S40 smart thermostat.
Adam P.
Adam P. Checked in
Replacement of the existing gas furnace and central air unit with a new high-efficiency variable-speed system. A new furnace will be installed with new 2" venting for fresh air and exhaust. The existing CSST gas line will be replaced with black iron piping running from the gas regulator to the new furnace. The return drop will be modified to allow for the installation of our AirBear filtration unit, and all other connections will be remade. The new A/C unit will be placed in the same location, installed on a new gravel footing and a composite unit pad, with a new disconnect and updated electrical connections. The entire system operation will be controlled by a new Lennox S40 smart thermostat.
Bow, NH 03304
Mark D.
Mark D. Checked in
Installation of an additional zone off of the existing boiler to provide heating for the finished space and workshop in the basement. An additional circulator will be installed off of the existing header at the boiler location. Piping will be installed to route from the boiler location to the baseboard and back, to complete the zone. The existing Taco switching relay will need to be upgraded to allow for the additional zone of heat. A length of baseboard will be installed in the workshop and on the immediate backside, underneath the TV in the finished room, another length of baseboard will be installed. A basic programmable thermostat will be installed in the workshop to control the zone.
Nashua, NH 03064
Manchester, NH - Oil service on your Weil-McLain boiler. Everything went well. New nozzle, pump strainer, & tank filter. Combustion was great and it was very clean. I noticed a gridning noise from the burner. I belive it is the burning motor bearings starting to fail. I want to confirm with one of our more experienced technicians before mis-quoting you! When we confirm we will send you the proper quote. Thank you!
Jack D.
Jack D. Checked in
Oil service on your Weil-McLain boiler. Everything went well. New nozzle, pump strainer, & tank filter. Combustion was great and it was very clean. I noticed a gridning noise from the burner. I belive it is the burning motor bearings starting to fail. I want to confirm with one of our more experienced technicians before mis-quoting you! When we confirm we will send you the proper quote. Thank you!
Manchester, NH 03103
Jack D.
Jack D. Checked in
Annual maintenance on your Energy Kinetics Fronteir oil boiler. I completed the maintenance according to the manufacturer instructions. Everything went great. There are no necessary repairs.
Atkinson, NH 03811
Review
Excellent Service!
E Z - Manchester, NH 03102
Review
Quick service call to replace thermostat. Done in about 15 minutes, explained the workings. Very satisfied Great service as usual
Joseph - Merrimack, NH 03054
Review
Our furnace kept shutting off. Mark identified the issue and resolved the problem. Very much appreciate the service!
Oakwood Prop - Milford, NH 03055
Review
Jack was polite and very neat.
Sharon - Merrimack, NH 03054
Review
We have been working with GSMS for 8 years. They provide the best service for installs and maintenance. The people are very professional, friendly and do great work. Today Qwentin was the tech doing the service maintenance. This young man came at the time scheduled, knew what he was doing and did excellent work. If you are in need for heating, air conditioning and plumbing work, this is the company for you!
Claire - Merrimack, NH 03054
Review
Jack did a great job. Provided a lot of good information. Thank you
Don - Merrimack, NH 03054
Review
Excellent service
Kathleen - Merrimack, NH 03054
Review
Excellent Service
Sharon - Merrimack, NH 03054
Review
Excellent
Sharon - Merrimack, NH 03054
Review
Qwentin serviced our furnace and installed our new Nest unit. He was friendly, attentive and thorough
Barry - Manchester, NH 03109
Review
Only great service from Jack with GSMS. Longtime customer!
Michelle - Manchester, NH 03104
Review
Qwentin performed annual maintenance on our furnace. He kept us informed on how the process was going and closed up the basement when the work was completed. A very professional job!
Lori B - Hollis, NH 03049
Review
Always great service with GSMS
Ginger - Hollis, NH 03049
Review
Everything about the bathroom is great. Shower door works fine and looks good. I want to thank Mark and GSMS for doing a great job and also for being very neat, cleaning up each day after the work was done. The new bathroom is a perfect addition to our home. Thank you for all time helping to plan the bathroom.
Enid - Litchfield, NH 03052
Review
Great service , personality and thorough
Edie and Rich G. - Nashua, NH 03062
Review
Highly recommend!
Jason - Barrington, NH 03825
Review
5 🌟 excellent knowledge of produce and very professional
Alison - Bedford, NH 03110
Review
GSMS is my go to for all my air, heating and plumbing! Great service, great price and great people. Qwentin Gauvin has done the last three services at my home and he is always happy, professional and does a fantastic job!
Jared - Hooksett, NH 03106
Review
Quentin was awesome he was very professional, respectful and extremely knowledgeable and competent. Great personality. and exhibited interpersonal and communication skills.
Ronald - Merrimack, NH 03054
Review
Seems very knowledgeable, efficient and friendly
Nancy - Stratham, NH 03885
Review
Never problem with GSMS! They have installed and serviced my furnace and AC for 27 years. Over the years Mark has gone out of his way to fix problems and now crew is continuing his great service! I have recommended them to many people.
Joseph - Merrimack, NH 03054
Review
Mark and team are always outstanding!
Mark - Nashua, NH 03062
Review
Great service!
Beth - Manchester, NH 03104
Review
Great Company
Rich Guidoboni - Nashua, NH 03062
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