Our Company

Our Family Serving Yours, For Over 70 Years!

Climate Design Systems, originally founded in 1946 under the name of Haverhill Sheet Metal, is a full-service heating, air conditioning and indoor air quality contractor. We are locally owned and managed by some of the most experienced HVAC specialists in the Northeast.

Climate Design Systems is a division of Merrimack Valley Systems a recognized leader in heating, air conditioning and mechanical contracting in the Northeast. Both companies share a 36,000 square foot facility located in Methuen and serve the Merrimack Valley, Southern New Hampshire and Greater Boston.

We always take the time to educate our clients on guidelines, new and old, that need to be followed. As a green company, we are concerned with preserving our environment and inform our clients of local and federal funding available when they install systems that are energy efficient. Our Design Build Division always takes into consideration rebates from local utilities when designing mechanical systems.

All of our engineers and technicians are fully certified and trained. We have a staff of 150+ employees and maintain a fleet of 75 digitally-dispatched service vehicles equipped with the parts needed for a majority of repairs. Our staff keeps up with the latest in heating and air conditioning technology and is ready 24/7 to help with all of your home comfort needs!

Over 70 Years Serving Methuen MA

Our Mission

We are committed to our customers and the work we perform. We build long-standing relationships through fairness, reliability, and trust while providing a full array of heating, air conditioning, and home comfort solutions.

We’re committed to do the job…Every job—the right way.

We are a full service HVAC contractor providing repair, maintenance, and installation for all types of heating and air conditioning systems. We service the North Shore and Merrimack Valley including the communities north of Boston MA, and South of Manchester NH. We look forward to exceeding your expectations!

Buddy Thomas

Leonard “Buddy” Thomas
President & CEO
Merrimack Valley Corp.

As President and CEO of our parent company, Merrimack Valley Corp., Leonard “Buddy” Thomas has overseen the acquisition of Climate Design Systems and three other HVAC companies in the past five years which are now all Divisions of Merrimack Valley Corp. All of these companies have been brought back to local management which is a big part of the culture that Buddy believes in.

Having 35 years of experience in the HVAC industry, Buddy understands and has experience in all aspects of this business. He is responsible for the financials of all five companies as well as staying compliant with all local, government and federal guidelines, meeting the needs of employees, customers and vendors while continuing to set the strategy and vision for each company.

Dave Fay

Dave Fay

Dave Fay joined our parent company, Merrimack Valley Corp. in 1986. He has 29 years of experience in fabrication and installation. His responsibilities grew with the acquisition of Climate Design Systems and he now oversees the Fabrication Department for both companies. His responsibilities grew again as he became involved in Purchasing approximately ten years ago. In addition to managing the Fabrication Departments for both Merrimack Valley Corp. and Climate Design Systems, Dave is responsible for overseeing the purchasing of all materials for both companies. His many years of experience and involvement in the field coupled with his vast understanding of plumbing and HVAC supplies needed for the job allow him to ensure accurate job costing and customer satisfaction. His responsibilities include communications with Vendors, Suppliers, Field Staff, and Project Managers.

What They're Saying...

“I am writing this note…to let you know what a great job your team did with our central AC installation. Larry is one of the hardest working, diligent, and most dedicated workers I have ever seen. I am an HR Director and interview/hire people on a daily basis and he was really one of the most dedicated and caring people I have seen in a very long time.”

Stephanie & Michael
North Andover, MA

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