Granite State Mechanical Services

Company Overview

GSMS excels in providing service. For over three decades, we have provided plumbing, heating, and cooling services, including installations and repairs to both residential and commercial clients in New Hampshire.

Give us a call to arrange a meeting with our experts and discover how you can benefit from energy savings, improved indoor air quality, and enhanced efficiency of your comfort system. We offer no-cost estimates for every customer, along with fair, transparent pricing and courteous, professional service.

Our customers always come first. Our team is on call 24 hours a day, 7 days a week to maintain your comfort. GSMS started as a solo venture by owner Mark Downing. In the past 25 years, we have expanded to serve our customers better without losing the personal touch of a family-run 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.