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
Janet Paulson
19:58 10 Dec 25
Great service at a most reasonable price.
Ben Verville
15:20 09 Dec 25
Qwentin came out and helped us with our boiler. He was professional, kind and knowledgeable. He took the time to educate us on our heating system and kept us informed on what was going on and what to look out for in the future. Gina was helpful and accommodating with all the scheduling and got us taken care of asap when the problem arose. Thank you guys!
Jordan Bluhm
18:50 08 Dec 25
Unfortunately I was outside their catchment area, but when I asked if they knew any other company who would service my unit (isobar 3 Sidewindr) Zak and Gina went above and beyond and found someone who would service it! Amazing service!
