Recent Jobs and Reviews
At a glance
GSMS Air•Heating•Plumbing has completed 10 jobs in October 2026.
The 25 customer reviews shown here average 5.0 out of 5.
The most recent job was on October 26, 2026.
Recent work covers Manchester, NH, Merrimack, NH, Bedford, NH, Barrington, NH and Bow, NH.
Job Locations and Reviews
Completed the gas furnace maintenance. Everything went great. Please see the attached form.
Completed the oil boiler maintenance. Everything went great! Please see the attached forms.
Completed the oil furnace maintenance. Everything went great. Please see the attached form.
Repair section of copper water piping.
Completed the gas furnace maintenance. Everything went great. Please see the attached form.
Maintenance today on Rinnai boiler. Maintenance kit servicing is necessary to be completed.
First, I want to commend you both on the incredible work you are doing remodeling your home! Pairing your recent NH Saves insulation work, working on new windows, and with a completely modernized HVAC system is the smartest way to maximize your home's efficiency and comfort. This proposal outlines the complete removal of your aging oil boiler and hydro-air system. In its place, we will install a brand-new, high-efficiency natural gas Combi Boiler to handle your baseboard heating and domestic hot water. For the addition and the front of the home, we will install a premium 2-Zone Mitsubishi Hyper Heat system to provide top-tier summer air conditioning and highly reliable winter heating. Scope of Work 1. Demolition & Equipment Removal Boiler Removal: Because there is no bulkhead access, our team will safely break down the heavy cast-iron oil boiler into manageable sections to remove it from the basement. Oil Tank Removal: We will coordinate with our specialized environmental subcontr
I found that the boiler was extremely sooted up. I cleaned the heat exchanger and the flu pipe. The inducer motor is extremely sooted up and rotting and the burner tubes are rotting out as well. I had to red tag the unit until we come back and replace the burner tubes and the inducer. Also a ninety degree fitting needs to get replaced on the vent pipe.
Furnace PM
GSMS was quick to respond to my heater issue and scheduled a technician, Jack. He was very knowledgeable and thorough in diagnosing the problem and explained what he did to resolve it.
Bad condensate pump. Replace with new pump.
Friendly and knowledgeable, gets the job done right.
In the twelve years that zI have had the ductless mini splits, never has a cleaning been done that I just experienced. I cannot say enough regarding this young man who went above and beyond and paid attention to every detail. It was a pleasant experience and he had incredible patience with my pup who followed him throughout the house.
Good service and very efficient. Easy to address issues and coordinate appointments.
Qwentin always provides knowledgeable and friendly service.
Great team of people right from Gina who answers the calls to the service technicians and the owners. Extremely responsive to emergencies and customer needs.
Very pleased with GSMS!! Today we had Qwentin who did the fall service on our furnace. Super nice young man that is very polite, professional and very knowledgeable. Would highly recommend GSMS! We could not be happier with this company. 5 star!!!!
Wow! I'm so excited to become a GSMS Air Heating Plumbing Home Club Member! Qwentin Gauvin is absolutely fabulous. So kind and talented and dedicated. I am so grateful!!
Welcome to the club, Rachel!! Qwentin is one of our amazing Specialists and I'm so grateful we can take care of you and your home! -Zak
Granite State Mechanical Services is the best! I highly recommend them for all your plumbing & HVAC needs!
Qwentin provided excellent service today. He is a very professional and personable young man. Granite State is lucky to have him on their team.
Jack came right on time and figured out my heating problem right away. He got me a new thermostat, installed it and the price was very fair for his time and the new thermostat.
GSMS has been the most professional and helpful company we have worked with. They have helped with a handful of small project with plumbing and heating issues leading up to them installing a brand new boiler into our home. They were always willing to answer any questions I had and even made noise visits to talk about the project which was greatly appreciated. Every person that has come to help us out has been so knowledgeable, friendly, and helpful which makes the project so much better. The new installation of the boiler went smoothly and they were able to explain everything going on to me when I asked and left me feeling so great with the new unit that was put In. We will continue use GEMS due to their fair pricing, great quality of work, and the personal care you can feel from everyone that you work with.
Wow, I am so appreciative of you sharing your experience Brian! We work so hard each and every day to ensure we deliver this experience. Thank you for trusting my team and I with your home and we welcome you to the GSMS Family! -Zak
Love dealing with this company. Their techs are always prompt, efficient and courteous. We've been happy to be their customer since 2010.
Thank you so much for the kind words and for being part of the GSMS family since 2010! It means the world to us to have earned your trust over the years. I’m proud of our team for continuing to deliver the kind of service that keeps clients like you coming back. We truly appreciate your loyalty and support. – Zak D., Second-Generation Owner
Qwentin was on time, very friendly and professional. He was able to identify the issue, communicate it effectively, and then fix it. Highly recommend.
Thank you so much for the kind words and for trusting GSMS to take care of your home. Qwentin is a rising star on our team, and it means a lot to hear that his professionalism and communication made a strong impression. As a local, family-run business, we’re grateful for your recommendation and honored to have earned your trust. – Zak D., Second-Generation Owner
Great service again. On time and professional. I highly recommend GSMS.
Thank you for the great review! I’m glad to hear our Specialist was able to get your water heater squared away and offer some extra tips while he was there. We always aim to go beyond just the repair, and I really appreciate you taking the time to share your experience. Thanks for choosing GSMS — it means a lot to our family and our team. – Zak D., Second-Generation Owner
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