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Our Service Area

Proudly serving New Hampshire homeowners with local heating, air & plumbing services.

At GSMS, we are proud to serve New Hampshire with our comprehensive range of HVAC and plumbing services. As a family-owned business with 35+ years of experience, we have built a reputation for excellence, reliability, and outstanding customer care. Our skilled technicians are dedicated to providing top-quality repairs, installations, and maintenance tailored to meet the unique needs of New Hampshire homeowners.

From air conditioning and heating services to plumbing repairs and installations, we ensure your home remains comfortable and efficient year-round. Our commitment to quality and customer satisfaction sets us apart as the trusted choice for all your home comfort needs.

Explore our service area below, read reviews in your city, and see why homeowners across New Hampshire trust GSMS for their HVAC and plumbing needs.

Contact us online today or call 603-424-8258 to schedule your service and experience the GSMS difference.

Recent Jobs and Reviews

Rated 5.0 out of 5 stars based on 121 customer reviews

Customers say: The reviews exhibit a positive sentiment towards GSMS, with many customers expressing satisfaction with the company's services. The positive reviews highlight the quality of the work, the professionalism of the technicians, the timeliness of the service, and the fair pricing. Customers also appreciate the friendly and courteous behavior of the technicians, particularly Jack, who is described as thoughtful, meticulous, and providing great value. Additionally, customers mention the prompt and efficient service provided by the crew, as well as the helpfulness and expertise of Mark and Adam. The recurring themes in the positive reviews include appreciation for the company's reliability, punctuality, and the quality of the work performed. However, there are a few negative reviews, but their weight is much less than the positive reviews. The negative reviews mainly focus on issues related to scheduling or communication, such as appointments being rescheduled or technicians arriving late. However, the company's response to these issues is also highlighted, with customers appreciating the efforts made to rectify the situation and provide satisfactory resolutions. Overall, the sentiment expressed in the reviews is positive, with customers expressing satisfaction with GSMS's services and technicians. The recurring themes of professionalism, punctuality, quality of work, and friendly service are consistently mentioned, indicating a high level of customer satisfaction.

Job Locations and Reviews

Review
We are so glad to have found GSMS. Jack is very knowledgeable and courteous. We had a bad experience with our previous company and really needed to find someone who services System 2000. We are very pleased with the work and would highly recommend them. Their prices are very fair too.
Laura - Londonderry, NH 03053
Jack D.
Jack D. Checked in
Repairs flue pipe going into chimney. Seal with high temp furnace cement. Install brackets to secure flue to chimney. Replace expansion tank and relief valve on water heater.
Londonderry, NH 03053
Mark D.
Mark D. Checked in
Thaw out pipe,new new switch on condensate pump check for warranty
Manchester, NH 03102
Qwentin G.
Qwentin G. Checked in
I started off with performing a leak search on the living room and the basement Fujitsu heads. I found that the living room head was leaking. The mini split head in the basement did not appear to have any dye on it. I connected my gauges to the outdoor unit and was getting very low pressure indicating that there is a good size leak since I just added refrigerant to it a month ago.
Chester, NH 03036
Jack D.
Jack D. Checked in
Today we replaced the expansion tank and air vent on the boiler. We removed the straight section of baseboard that was up against the wall where the clients want to put book shelves and a couch. We relocated the baseboard into two sections on adjacent exterior walls. We installed a leak stop valve on the hot water tank. We also installed a hot and cold frost free outside hose fixture.
Epping, NH 03042
Adam P.
Adam P. Checked in
We’re pleased to propose the installation of our GSMS Choice central air systems, designed to provide your home with reliable, quiet, and comfortable conditioned air. This project includes two separate systems to serve each floor of your home, maximizing efficiency and comfort. This system is our new A2L refrigerant system with R454-B refrigerant. First Floor: System Setup: Ductwork will distribute supply registers throughout the floor for consistent air circulation. These registers will feature our standard dark brown metal grille. Returns: Common return vents will be strategically placed to ensure balanced airflow. Second Floor: System Setup: Supply registers will be installed on the ceiling throughout the second floor, featuring our standard white plastic grille. Dedicated Returns: Each bedroom will have a dedicated return vent, ensuring proper airflow even with doors closed. Attic Access & Safety: Decking will be installed to provide safe access to the air handler in the attic. A
Greenland, NH 03840
Mark D.
Mark D. Checked in
Zone working fine
Hooksett, NH 03106
Review
Great service, a pleasure to have service our equipment
Currier - Manchester, NH 03104
Mark D.
Mark D. Checked in
Replaced flue pipe,chimney needs inspection
Manchester, NH 03104
Mark D.
Mark D. Checked in
Check gas pressures and vent.Notice in coming pressure was lower than last time.Contacting Rinnai rep to go over some things.
Manchester, NH 03104
Review
Great service and response time
Currier - Manchester, NH 03104
Mark D.
Mark D. Checked in
Replace kitchen hot water heater
Windham, NH 03087
Jack D.
Jack D. Checked in
Diagnosed a loose wire. Found the circulator to be receiving power but not running. We replaced the pump, relief valve, and expansion valve. We found the flue pipe needs to be replaced. We will come back tomorrow to replace.
Manchester, NH 03104
Review
Plumbing review
Colleen - Manchester, NH 03104
Review
Quentin did a great job and was a pleasure to work with. He is typical of all the employees of GSMS. Top quality work and friendly
Barry - Manchester, NH 03109
Response from GSMS Air•Heating•Plumbing:

Thank you, Barry! Qwentin is an excellent addition to our GSMS family and I'm so pleased to hear he took great care of you. Your nest thermostat that was acting up on us, was replaced under warranty with a new generation 4 nest thermostat. Thank you for being a Home Club member!

Review
Nice clean work and very professional! I’m happy with my new heating system! Communication was great!
Matt @ swains lake - Barrington, NH 03825
Review
GSMS was punctual, thorough, and did a great job of explaining their procedures (and test outcomes). Highly recommend!
JD - Barrington, NH 03825
Review
Excellent service
Ronald - Merrimack, NH 03054
Review
Great service!
Dragan - Derry, NH 03038
Review
Mark was super responsive with our no-heat situation and quickly able to fix!
DWS - Barrington, NH 03825
Review
As usual, Adam's work is stellar.
Bob Bedrosian - Merrimack, NH 03054
Response from GSMS Air•Heating•Plumbing:

We are so glad to hear that you had a good experience.

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