0% Interest Financing and Lennox Rebates Up to $1,800
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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

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.

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.

Feel The Love
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Trusted Quality & Service
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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

Elaine Hamel
Elaine Hamel
20:02 12 Jan 26
Working as a renovation contractor for over two decades I dealt with many subcontractors over the years. I am happy to share that GSMS went above and beyond on a recent heating system install for me. They were very understanding of my current living situation, accommodating on every level and very professional. I highly recommend them.
Mike Fitzgerald
Mike Fitzgerald
15:20 12 Jan 26
Diagnosed issue today and ordered parts for fixing. Qwentin was Great and very helpful in explaining the issue.Hoping to get it fixed this week - TBDEstimated fix price as well.
Venkatesh Natarajan
Venkatesh Natarajan
14:50 12 Jan 26
Jack Downing did an outstanding job performing by annual furnace service and checks. He was professional, courteous , arrived on time and completed the work efficiently.
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Trusted Quality & Service