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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 4.9 out of 5 stars based on 139 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

Jack D.
Jack D. Checked in
Everything went great with your Rinnai maitnenance. Thank you!
Windham, NH 03087
Review
As always we are very happy with the quick and complete service that we experience with your team. They are professional and personable young men who make the extra effort. It is nice to have, and keep confidence in Granite State Mechanical Services. Thank you.
Susan - Salem, NH 03079
Review
Excellent service.
Laura - Nashua, NH 03060
Jack D.
Jack D. Checked in
Tankless flush and troubleshoot humidifer.
Nashua, NH 03060
Jack D.
Jack D. Checked in
Plumbing inspection went great. I fixed the downstairs shower handle. I will send you an estimate to replace the basement toilet.
Nashua, NH 03062
Jack D.
Jack D. Checked in
The plumbing maintenance went well. We found a bathroom faucet that needs to be rebuilt. Both shower heads should be replaced. We will send estimates.
Salem, NH 03079
Mark D.
Mark D. Checked in
Cut ceiling on first floor bath rm.Insulation was wet ran shower for 20min no leaks.Filled tub and drained no leaks.Sprayed walls with hand held shower a little water by shower valve sealed chrome plate
Nashua, NH 03060
Jack D.
Jack D. Checked in
We will send estimates for the two shower valve replacements. Thank you!
Hollis, NH 03049
Jack D.
Jack D. Checked in
Everything went great with your maintenance. I adjusted the master bathroom shower to 120 deg F. It was previously 113. Thank you.
Hollis, NH 03049
Review
very knowledgeable, great service!
JD - Barrington, NH 03825
Jack D.
Jack D. Checked in
Replace boiler refractory and ignitor with OEM Viessmann parts.
Barrington, NH 03825
Qwentin G.
Qwentin G. Checked in
Replace 4 burners and the burner housing which is corroded/ damaged. After reconnecting the gas pipe, I checked all of the fittings with a leak bubble solution. I rechecked the gas pressure in the gas valve as well. Lastly, I did a combustion test to check for oxygen, CO and CO2 levels and everything looked great.
Deerfield, NH 03037
Review
The visit showed what was the problem and will soon be resolved.
Paul - Nashua, NH 03062
Review
Service with a smile
Guimont - Londonderry, NH 03053
Mark D.
Mark D. Checked in
The office will call to schedule the toilet replacement. Thank you.
Nashua, NH 03062
Review
Granite State Mechanical Services is the only plumber you will ever need! Friendly, knowledgeable, trustworthy and reliable! They do annual maintenance but also remodels. I first met Mark in 2007, when he worked on my kitchen remodel and added air conditioning to my home. We were so happy with the work, we started using GSMS for our annual service. Since then the business has grown to include his sons. Any plumbing issue I have I get immediate service. You can’t go wrong with GSMS!
Colleen - Manchester, NH 03104
Review
👍
Guimont - Londonderry, NH 03053
Review
Excellent & Friendly Service
Barry - Manchester, NH 03109
Review
Very knowledgeable and personable , explained what what was being done and did the work quickly and cleanly. Highly recommend!
John - Northfield, NH 03276
Review
Excellent service
Guimont - Manchester, NH 03103
Review
As usual, Jack'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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