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Premier Heating, Air & Plumbing from a Family-Run New Hampshire Business

Heating Services
Cooling Services
Plumbing Services
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We're Local. We're Family-Owned

HVAC Contractor & Plumber Services For Homes & Businesses

GSMS is your all-in-one destination for plumbing, heating, and cooling solutions in New Hampshire. We stand as a beacon of reliability, offering award-winning services rooted in family-owned traditions. With a commitment to your comfort and satisfaction, we bring 35+ years of experience to every project. We’re here to elevate essential systems of local homes and businesses.

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Excellence Defines GSMS

Comprehensive, Expert Care for Every Room

Trusted Quality & Service
  • Best Of The Best
  • Expertise 2024
  • Lennox Premier Dealer
  • Mitsubishi Diamond Contractor
  • Rinnai
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Since 1987

Why Choose GSMS

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Family Business You're supporting a local NH family with its second generation of ownership, not some big out-of-state corporation.
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WOW Warranty We only install systems that meet our standards. That means we stand behind them with industry-leading labor warranties.
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GSMS Smart Monitoring Our unique sensors analyze your air and heating systems daily. This allows us to predict issues before they happen.
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Helping Our Community Through our "We Heart Local" initiative, we donate a portion of our profits every month to local NH organizations in need!
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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.
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Let's Make Home Enjoyable Again.

Total home protection, rewards, discounts, and smart monitoring. It’s all yours when you’re in the club.

Countless 5-Star Reviews

Great Service Makes For Great Reviews

Jim Cannon
Jim Cannon
19:21 29 Sep 25
I've hired many companies over the years. Mark's company GSMS is the best I ever worked with. Great company that does things right, excellent service at a fair price. I HIGHLY RECOMMEND GSMS.
Matt St Peter
Matt St Peter
14:29 26 Sep 25
Adam and Quinn did a great job with a furnace and ac installation to replace my 24 year old equipment. Adam brings plenty of experience and knowledge of hvac equipment so I was quite pleased with the end result. A small company but quality workmanship that shows. Great job guys!
Deb Anderson
Deb Anderson
18:39 24 Sep 25
Jack is exceptional, professional and friendly! Today's service call was for maintenance on our home's furnace. Everything was done quickly and professionally. GSMS will always service our homes. Thank you, GSMS is the best!
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Serving New Hampshire

No matter where you call home in New Hampshire, GSMS is here to ensure it remains a haven of comfort throughout the seasons. We work all across NH to deliver great service exactly where you need it. Our Service Area
Trusted Quality & Service
  • Best Of The Best
  • Expertise 2024
  • Lennox Premier Dealer
  • Mitsubishi Diamond Contractor
  • Rinnai
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