Granite State Mechanical Services

Company Overview

GSMS excels in providing service. We have been offering plumbing, heating, and cooling services, including installations and repairs to the communities of New Hampshire.

Give us a call to arrange a meeting with our experts and see how you can optimize energy savings, air quality, and the efficiency of your home's systems. We provide free estimates to all our customers, accompanied by competitive, clear pricing and respectful, expert service.

Our customers always come first. Our technicians are available 24/7 to ensure your comfort. GSMS started as a solo venture by owner Mark Downing. Over the last 25+ years, we have grown to meet our customers' needs while maintaining the friendly, reliable service of a family business.

I joined our family business in 2009. My father founded GSMS in 1987, and we are committed to moving forward by treating our customers well and upholding quality.