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
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
Dana Hill
16:12 21 May 25
This company is so awesome, my Husband and I just bought our condo, we are new to New Hampshire, I noticed the company sticker on our furnace and called them to schedule a maintenance check on our heating/cooling system. I was happy to find out that they installed the system. The tech Jack showed up on time, wearing a mask, which I appreciated so much because I am a senior citizen. Jack put on booties when he entered our house and then proceeded to answer all of my questions about our system, he instructed me on how to program the the thermostat. He checked out our system and cleaned out our outside unit thoroughly. Jack answered all my silly questions with a smile. Thank you GSMS
Mary McCluskey
20:30 16 May 25
We are back on track with AC just in time for the heat. Thanks to Mark, Jack and Quentin.
Mark Milliken
17:27 07 May 25
GSMS recently installed a mini split system and a hybrid water heater in our home and we could not be happier with the service and results. Zak has been awesome to work with. The staff are professional and the work was completed as promised. Highly recommend GSMS!
