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Granite State Mechanical Services, LLC

When you need service or repairs on your home’s heating, cooling, or plumbing system we are ready to serve you. From the moment you call our office to when our truck is backing out of your drive, your experience with GSMS will be exceptional. We strive to train and educate our Specialists so they have the knowledge and experience to properly provide you with service.
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About Granite State Mechanical Services, LLC

ounded in 1987 by Mark Downing, Granite State Mechanical Services has provided professional installation and service of heating, cooling, and plumbing products for New Hampshire’s homeowners and businesses for over 30 years. Throughout the course of 3 decades, we’ve learned a lot and still to this day continue to innovate to always make sure we are arriving to a customer’s home as the Service Specialists™.
Year Established
Phone Number
(603) 634-8578

Heating, Mini-Split Ductless, Furnace Installation/Replacement, Boiler Installation/Replacement, Energy Kinetics Boiler by GSMS, Cooling, Air Conditioning Repair/Installation/Replacement, Mitsubishi Mini-Split Systems, Plumbing

Services Offered

  • Financing



Industry Certifications

  • Better Business Bureau



States Served