" Jonathan Duncklee named 2012 Employer of the Year
by the Greater Mystic Chamber of Commerce!"
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Meet the Presidents

Comfort. Quality. Reliability.


Lester H. Duncklee
Our Late Founder


Jonathan Duncklee

For more than 45 years we have delivered dependable, high quality cooling and heating products.

We’re eager to serve your comfort needs for years to come.

In keeping with the Mitsubishi philosophy for designing and building the best product, we at Duncklee Cooling & Heating, have added to the best of service in the business.

Our record speaks for itself. Duncklee Cooling & Heating has been servicing the Eastern Connecticut & Rhode Island area since 1973. We offer custom system design, installation and total service.

Our commitment to comfort, quality and value has allowed us to become the area’s leader in heating, ventilation and air conditioning (HVAC) technology and service.

The way we see it, we want to get the most for our money, and we think our customers should too. That’s why they continue to use Duncklee Cooling & Heating. Keeping you comfortable is our goal. We want to be your HVAC company today, tomorrow and for years of comfort to come.

Company Timeline

Duncklee, Inc. became incorporated as a Connecticut Corporation named L.H. Duncklee Refrigeration, Inc. with certification to perform work in Connecticut.

The Contracting Department separated from the Service Department, expanding Duncklee, Inc.’s contracting business to provide the most professional and competitive bids in New London County and Eastern Connecticut.

Duncklee, Inc. became licensed to perform work in the state of Rhode Island.

Duncklee, Inc. formed a separate division dedicated to installing complete air distribution systems.

During the rapid industry growth of the “business boom,” Duncklee, Inc. expanded our workforce to 30 staff members to accommodate growing business demand.

Jonathan L. Duncklee joined the company.

Duncklee, Inc. began a period of downsizing and restructuring to adjust to a slower economy.

A record heat wave created increased business activity. Duncklee, Inc.’s Service Department grew to meet its client’s needs.

As part of Duncklee, Inc.’s commitment to education in the industry, again Duncklee, Inc. began training initiatives to develop trade apprentices.

Duncklee, Inc. hired a new salesman to penetrate larger markets; and have expanded the focus of our marketing strategy to include new communities.

Duncklee, Inc. moved to its new headquarters at 296 Taugwonk Road in Stonington.

Duncklee, Inc. expanded the new headquarters to double its original size to 6400 square feet.