Premier Heating, Air & Plumbing from a Family-Run New Hampshire Business
We're Local. We're Family-Owned
HVAC Contractor & Plumber Services For Homes & Businesses
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Excellence Defines GSMS
Comprehensive, Expert Care for Every Room
GSMS Joins Lennox in Spreading Warmth Through the “Feel the Love” Program
This year, our team had the privilege of installing a brand-new Lennox system for a local public figure whose selfless work continues to empower young women and strengthen our community.
Trusted Quality & Service
Since 1987
Why Choose GSMS
Family Business
You're supporting a local NH family with its second generation of ownership, not some big out-of-state corporation.
WOW Warranty
We only install systems that meet our standards. That means we stand behind them with industry-leading labor warranties.
GSMS Smart Monitoring
Our unique sensors analyze your air and heating systems daily. This allows us to predict issues before they happen.
Helping Our Community
Through our "We Heart Local" initiative, we donate a portion of our profits every month to local NH organizations in need!
Great Service Promise
Affordable pricing, 5-star service, and pride in our work. If you're not satisfied, we'll make it right. It's how we've worked since 1987.
Let's Make Home Enjoyable Again.
Countless 5-Star Reviews
Great Service Makes For Great Reviews
Alison B MacDermott
21:20 02 Feb 26
Quentin was fantastic, he helped me replace a part and figure out the problem , he came right away and was very professional, , knows his trade extremely well and charges fairly, excellent job!
Ann Flanagan NH Real Estate School
20:00 02 Feb 26
It was a two day job, and Adam and Jack worked late to make sure we weren't without heat the first night!Qwentin was knowledgeable, helpful, and patient!
Barry Fitzgerald
18:47 02 Feb 26
Mark and all of the team have been a fantastic company to work with over the past 15 years. I would recommend them for any of your plumbing/HVAC needs
