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™.