Duncklee Cooling & Heating: Stonington CT’s Trusted HVAC Partner Since 1973

Duncklee Cooling & Heating is a family-run HVAC company based right in Stonington, Connecticut. For over 50 years, they’ve been the go-to choice for heating and cooling services across Eastern Connecticut and Rhode Island. Whether it’s a sudden furnace breakdown on a cold Norwich night or planning a new system for a home in Mystic, the team is ready to help. They offer emergency service for urgent repairs and focus on both residential and commercial projects. Their technicians are trained, experienced, and dedicated to getting the job done right.

Key Services for Homeowners and Businesses

Duncklee Cooling & Heating handles the full range of heating and cooling needs. Their main services include:

• HVAC installation or replacement: They design and install systems tailored to your home’s layout and your family’s comfort. Whether you’re in an older Colonial in Stonington or a newer build in Groton, they help select efficient units that fit your budget.
• HVAC system repair: From fixing noisy air conditioners in summer to servicing heat pumps during chilly winters in Mansfield, their repair team responds quickly to restore comfort.

They also focus on improving indoor air quality and lowering energy bills—common concerns for locals dealing with humid summers and cold, snowy winters.

Areas Served Across Eastern Connecticut

Duncklee Cooling & Heating proudly serves a wide region. This includes Norwich, New London, Mansfield, Windham, Waterford, Montville, Madison, East Lyme, Willimantic, Killingly, Storrs, Plainfield, Ledyard, Coventry, Griswold, Old Saybrook, Groton, Old Lyme, and many more towns from Mystic to Willington. Their deep knowledge of local homes—from shoreline properties in Niantic to rural farms in Lebanon—means they understand the specific heating and cooling challenges of the area.

Company History: A Family Legacy

The business was founded in 1973 by Lester H. Duncklee. From the start, it was strictly family-owned and operated, with a hands-on approach to every project. That personal investment built a strong reputation in the community. In 2012, Jonathan Duncklee was named Employer of the Year by the Greater Mystic Chamber of Commerce—a testament to the company’s standing. Today, Duncklee Cooling & Heating remains a staple in Stonington CT, known for reliability and quality workmanship.

Leadership with Local Roots

Jonathan Duncklee now leads the company as President, continuing his father’s vision. He often shares that his father’s perseverance, courage, and compassion shaped both the business and his own life. This family connection isn’t just background—it’s why the team treats every customer like a neighbor. Jon and his crew are active locally, supporting the community they’ve been part of for generations.

Specialties & Highlights

• Over 50 years in business: Few HVAC companies in Eastern Connecticut can match this longevity.
• Family-owned and operated: Decisions are made locally, with a focus on customer relationships, not corporate policies.
• Custom system design: They don’t just install units; they plan systems that suit your home’s specific needs.
• Broad service area: They cover dozens of towns, offering consistent service from Pawcatuck to Voluntown.

Why Locals Choose Duncklee Cooling & Heating

Residents and businesses across the region turn to Duncklee Cooling & Heating because they combine deep local knowledge with dependable service. When you call Duncklee Cooling & Heating in Stonington CT, you’re getting a team that understands New England’s climate challenges and the types of homes found here. They’ve built trust through decades of honest work, fair pricing, and a commitment to keeping families comfortable year-round. For heating and cooling solutions that stand the test of time, Duncklee Cooling & Heating remains a trusted name in Stonington Connecticut and beyond.