Granite State Mechanical Services

Company Overview

Service is our expertise at GSMS. For over three decades, we have provided heating, cooling, and plumbing installations, maintenance, and repairs to both residential and commercial clients in New Hampshire.

Reach out to us to have a team member meet with you and learn about energy savings, indoor air quality improvements, and the efficiency of your home's comfort system. We provide free estimates to all our customers, coupled with honest, straightforward pricing and professional, friendly service.

Our customers always come first. Our team is on call 24 hours a day, 7 days a week to maintain your comfort. As a family-owned business, GSMS began as a one-man operation led by Mark Downing. Throughout more than 25 years, we have evolved to satisfy our customers' demands while preserving the warmth and reliability of a family business.

I have been part of our family business since 2009. Since my father established GSMS in 1987, we have remained dedicated to customer satisfaction and quality service.