Connecticut
HVAC in Connecticut
20 HVAC companies in the metro area within about 25 miles of Hartford – plus how Connecticut licenses HVAC work.
Metro areas
Connecticut cities we cover
Connecticut rules
Do HVAC contractors need a license in Connecticut?
How Connecticut licenses HVAC work
HVAC contractors are licensed by the state.
Who licenses: Connecticut Department of Consumer Protection (State Board of Heating, Piping, Cooling and Sheet Metal Work Examiners)
License types: S-1 Unlimited Heating, Piping, and Cooling Contractor, S-3 Limited Heating, Cooling and Piping Contractor, S-9 Limited Heating Cooling Contractor, D-1 Limited Warm Air, Air Conditioning and Refrigeration Contractor, D-3 Limited Cooling Contractor, B-1 Limited Gas and Oil Burner Contractor, B-3 Limited Gas and Oil Burner Contractor, SM-1 Limited sheet metal contractor, SM-3 Limited sheet metal residential/light commercial contractor.
Companies: Under Conn. Gen. Stat. Sec. 20-334(a) no one may perform or offer to perform heating, piping, cooling or sheet metal work (defined in Sec. 20-330 to include air conditioning, refrigeration, boilers and ductwork) without first obtaining a license. Contractor licenses are issued as unlimited or limited, and journeyperson licenses must work for a licensed contractor.
Check a license: elicense.ct.gov
Look the contractor up on the state eLicense lookup and confirm the license type (for example S-1, S-9 or D-1) covers heating, cooling or refrigeration work and is active.
Federal rule: in every state, technicians who handle refrigerant must hold EPA Section 608 certification, whatever the state or city requires.
Sources: portal.ct.gov, cga.ct.gov, law.cornell.edu, portal.ct.gov. Checked October 2026 from official sources. This is not legal advice.
Before you hire
Ask for the license number and check it on the official lookup where one exists. Ask for proof of insurance and a written, itemized estimate, and ask who pulls the permit if the job needs one – a new furnace, heat pump or air conditioner usually does.
Questions
Connecticut HVAC questions
Do HVAC contractors need a license in Connecticut?
Connecticut licenses HVAC contractors statewide through the Connecticut Department of Consumer Protection (State Board of Heating, Piping, Cooling and Sheet Metal Work Examiners). You can check a license at elicense.ct.gov.
Where in Connecticut do you list HVAC companies?
In Connecticut: Hartford (20). Each city page lists companies based within about 25 miles – 35 in smaller metro areas – whose own website names that city or nearby towns.
Do technicians need EPA certification?
Yes, in every state: federal rules require technicians who handle refrigerant to hold EPA Section 608 certification. A state or city license is a separate requirement.
How do I get an HVAC company listed in Connecticut?
HVAC companies can add their business free. We check every listing against the business’s own website.
Neighboring states: New York · Massachusetts · Rhode Island.
Request an HVAC company
Ask us to find an HVAC company in Connecticut
Tell us the job and your ZIP code. We pass it to listed companies that serve your area.
No heat in freezing weather, or no cooling in dangerous heat? Call a company from the list that says it takes emergency calls – a form is not fast enough. If you smell gas or a carbon monoxide alarm sounds, leave first and call 911 or your gas utility from outside.