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We strive to foster a work environment that includes and embraces racial, ethnic and gender diversity. Our commitment to diversity and inclusion helps us attract and retain the best talent, enables employees to realize their full potential, and drives high performance through innovation and collaboration.

Our Mission

To provide the best value HVAC and mechanical systems installation and service, principally in the mid-market commercial industrial and institutional sectors, while caring for our customers, employees and the environment.

The main cores of our business are commercial mechanical contracting, commercial plumbing and HVAC service, and preventative maintenance. We build and maintain high quality systems that are long-lived and highly-efficient providing an excellent return-on-investment and low energy costs.

Comfort Systems USA, Inc., together with its subsidiaries, is an equal opportunity employer in all aspects of employment and prohibits discrimination and harassment of any type to all individuals regardless of race, color, religion, sex, sexual orientation, national origin, age, disability, veteran status, or any other characteristic protected by federal, state or local laws. This policy applies to all terms and conditions of employment, including recruiting, hiring, placement, promotion, termination, layoff, recall, transfer, leaves of absence, compensation and training.

Our Philosophy

We believe that by providing our customers with quality, efficient and maintainable systems for their capital investments and then providing excellent service and preventative maintenance, we are doing our best for our customers and the environment. This approach has resulted in excellent referral business from past and existing customers.

What Makes Us Different

At Granite State Plumbing & Heating, LLC we pride ourselves on our strong reputation of quality service and customer experience. Customer word of mouth referrals are key to our success! Currently, we are the largest Mechanical Company in NH and we’re proud to help every customer that needs our services.
We know that our customers’ experience is very important and one of the key components to a happy customer is job site safety. We have two full-time safety officers who are dedicated to job site inspections, who are able to provide assistance to our field technicians and project managers, as well as provide ongoing up-to-date safety training for our employees. We understand that job site safety is the utmost importance to our customers that is why the safety of our employees and customers is paramount to us and a philosophy we live by.

We also pride ourselves on having an in-house CAD department that utilizes the most up-to-date technology including our own Trimble Total Station! At the end of the day, we know how important it is to a customer to have installations done in a safe, timely manner. Through the use of CAD Fabrication Software we are able to create hangers in house to speed up the field installation, saving you time!


Granite State Plumbing & Heating, LLC was founded by Gerry Perron and incorporated in April of 1983 in the State of New Hampshire. From 1990 through 2005, GSPH was purchased by a series of increasing larger companies and is currently a wholly-owned subsidiary of Comfort Systems USA which is headquartered in Houston, TX. CSUSA is publicly traded on the NYSE under the symbol FIX.
In December of 2018 Gerry Perron retired. Ken Duchesne who previously served as Vice President for many years has proudly accepted role of CEO/President. Ken’s mission is to forge forward while retaining the stellar market reputation and respectful organizational team culture Gerry Perron committed to over the past 35 years.

Comfort Systems USA

Being part of a much larger entity leverages our talents and resources so we can provide a much broader range of technical expertise and service than otherwise possible. It provides for greater financial strength and purchasing leverage by centralizing certain functions – information technology, marketing, fleet purchasing agreements, etc. We are able to partner with sister companies to provide support for widespread geographical projects and programs.