Awards – Duncklee Cooling & Heating

Since 2015, Duncklee Cooling & Heating has been voted
Best of the Best by local residents

Duncklee Cooling & Heating named 2020 Small Business of the year by the Eastern CT Chamber of Commerce


Eastern CT – The Chamber of Commerce of Eastern CT will celebrate its 110th Anniversary and Annual Meeting on Tuesday, March 31, 5:30 – 8 p.m. at Foxwoods John Duncklee, President, Duncklee Cooling & HeatingResort Casino Celebrity Ballroom. The event includes the Annual Regional Chamber Awards—the ECTy, honoring outstanding businesses, nonprofits, innovators and individuals—and the Southeastern CT Cultural Coalition Awards. View List of Award Winners here. 

Local professionals and community members are invited to join the Chamber in recognizing the following winners:  Small Business of the Year, Duncklee, Inc. Cooling & Heating; Business of the Year, Pfizer; Community Revitalization Leader, A.R. Building Company; New Business Award, Café Otis; Nonprofit of the Year, Public Library of New London; Best Place to Work, Chelsea Groton Bank; Industry Innovator, Mohegan Sun; Tourism Leader of the Year, Bill Furgueson and Mystic Museum of Art; Board of Directors Special Award, Jack Malone of SCADD; Young Professional of the Year, Matthew Spring of Stifel; and Volunteer of the Year, Gail Weber of Minuteman Press.

The Southeastern CT Cultural Coalition, a collaborative partner with the Chamber, will also present their annual awards at this event. Mystic Seaport Museum and Eugene O’Neill Theater Center will be recognized as Outstanding Arts and Cultural Organizations. Atlantic Broadband will be named Outstanding Business Supporter of Arts and Culture. View in Chamber of Commerce Eastern Connecticut’s Newsletter.

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Duncklee Cooling & Heating, Inc. receives Top Performer award from the CT Green Bank for the second year in a row. 2018 & 2019

Out of more than 400 contractors who participate in the program, Jonathan Duncklee, President of Duncklee Cooling & Heating Inc. received a Top Performer award from the Connecticut Green Bank February 2020 in Rocky Hill, CT at the Connecticut Green Bank Headquarters.
Duncklee and the CT Green bank teamed up with CorePlus Credit Union and Capital for Change, Inc. to offer consumers super-efficient heating and cooling systems with extremely low interest financing.

Top Performers helped over 300 Connecticut families make home energy improvements – allowing them to save money, reduce their carbon footprint, and live more comfortably in their homes.

This alliance helps the State of Connecticut work towards meeting its climate change plan, which focuses on three mitigation wedges: de-carbonizing electricity generation, de-carbonizing transportation, and de-carbonizing buildings.


Connecticut Green Bank is the nation’s first green bank. Its focus is to “achieve cleaner, less expensive, and more reliable sources of energy while creating jobs and supporting local economic development”.

Founded in 2011, Connecticut Green Bank has deployed over a $1.6 billion dollars in capitol for clean energy projects across Connecticut.
In keeping with the Connecticut Green Bank philosophy of providing Connecticut with clean energy. 

Duncklee Cooling & Heating has delivered dependable, super-efficient, high-quality cooling and heating products for more than forty-five years.

Duncklee Cooling & Heating has been servicing the Eastern Connecticut and Western Rhode Island area since 1973, offering custom system design, installation and total service.

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

Jonathan Duncklee is proud to be selected for the top performer award for outstanding performance, providing his customers with Smart-E loans, saving his customers money and helping the environment with qualified cooling and heating systems.

Connecticut Rivers Council,BSA Presents
the 25th Annual Outstanding Leadership Award Dinner


2018 – Top Performer smart-e Loan – Awarded by Connecticut Green Bank

Jonathan Duncklee, President of Duncklee Cooling & Heating Inc., has received the Top Performer award from Connecticut Green Bank. Duncklee and the the Green Bank have teamed up with Core Plus Credit Union to offer consumers energy-efficent heating and cooling systems. Founded in 2011, Connecticut Green Bank has deployed over a billion dollars in capitol for clean energy projects across Connecticut. Duncklee Cooling & Heating has been servicing the eastern Connecticut and western Rhode Island area since 1973. This article was published on

Duncklee Cooling & Heating voted #1 in the 2018 Readers Choice Awards for Heating & Cooling Services by the New London Day!


2017 – Outstanding Leadership Certificate Awarded To Jonathan Duncklee of Duncklee Cooling & Heating In Mystic, Stonington, New London, Norwich, & Old Saybrook CT.

Jonathan Duncklee received this award in recognition of his participation in the Elite Diamond Contractor Peer Group 2017 Mitsubishi Electric Cooling & Heating.

Duncklee Cooling & Heating, Inc. Receives Outstanding Achievement Award from Mitsubishi Electric

Southeastern CT’s Duncklee Cooling & Heating Recognized Out of 3000 Companies

Jonathan Duncklee receiving award

Jonathan Duncklee, president of Duncklee Cooling & Heating recently received the Mitsubishi Electric Cooling and Heating Outstanding Achievement Award. From a group of over 3000 other companies ranked as national diamond contractor dealers throughout the country, Duncklee Cooling & Heating, Inc. was recognized for outstanding achievement and was awarded for sales performance, loyalty, customer service and training. The award was presented on Wednesday, October 28, 2015 at the annual Mitsubishi Cooling & Heating Diamond Contractor convention held in Las Vegas, Nevada, with over 400 people in attendance,

Jonathan Duncklee accepted the award on behalf of the 12 employees at Duncklee Cooling & Heating. In his acceptance speech at the Diamond contractor conference, Duncklee remarked “I am proud to bring this level of experience, service and knowledge to our customer base in southeastern Connecticut.”

Duncklee Cooling & Heating was founded by the late Les Duncklee in 1973. Licensed in Connecticut and Rhode Island, Duncklee Cooling & Heating is an expert in the custom design, installation and service of residential and commercial heating & cooling HVAC systems including super-efficient York warm air gas, oil, and heat pumps; Navien on- demand tank-less; and Mitsubishi ductless cooling and heating technology.

The Duncklee office is located at 296 Taugwonk Rd., Stonington CT and can be reached at 860-535-2552 or

Duncklee Cooling & Heating, Inc. awarded 1st place for the best heating and air condition contractor category in 2017 by The Westerly Sun.


Southeastern CT’s Duncklee Cooling & Heating in Mystic, CT, Stonington, CT, New London, CT, & Westerly, RI

2015 – Duncklee Cooling & Heating voted #1 in the 2015 Readers Choice Awards for Heating & Cooling Services by the New London Day!

We would like to take this opportunity to thank all of our valued customers for giving us this rich endorsement. We value your patronage and appreciate your confidence in us. We look forward to continuing to serve our community as your climate control expert!

2012 – Greater Mystic Chamber of Commerce names Jonathan Duncklee
the 2012 Employer of the Year

  • Eastern Chamber of Commerce Business of The Year Duncklee Cooling & Heating
  • Eastern Chamber of Commerce Business of The Year Duncklee Cooling & Heating

Other 2012 Accomplishments

Congressional Recognition by Congressman Joe Courtney

Official Recognition by Lieutenant Governor Nancy Wyman

Official Citation from the Connecticut General Assembly including:

Secretary of State, Representative Diana Urban

Speaker of the House, Christopher G. Donovan

President Pro Tempore, Donald E. Williams

2008 – Town of Stonington Official Citation from First Selectman Edward Haberek, Jr.

In recognition for “35 years of excellent and dedicated service to its customers in New England”

2000-2001-2002- 2003-2004
Trane Comfort Specialists-Highest Average
National Customer Satisfaction Survey

2001 – 2002 – Award of Merit
Alliance for Living

1998 – Mitsubishi Air-conditioning Sales & Service Excellence Award

1997 – Certificate of Appreciation-National Volunteer Week
Groton Family Support Center

1997 – Distinguished Dealer Award
Trane Company & Star Supply

1990 – Sales & Services Award Excellence Award
Mitsubishi Air Conditioning

1987 – Certificate of Appreciation For Outstanding & Dedicated Service
Connecticut Heating & Cooling Contractors

1987 – 1991 – Certificate of Appreciation
Chamber of Commerce of Eastern Connecticut