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Connecticut
HVAC companies in Hartford, CT
20 local HVAC companies based within about 25 miles of Hartford, listed A to Z with phone numbers, addresses and services. Paid placements are labeled.
No heat or no cooling right now?
If you smell gas or a carbon monoxide alarm sounds, leave first and call 911 or your gas utility from outside. Otherwise, call a company below that says it takes emergency calls. Quick checks first: AC not cooling · furnace not working.
The list
Hartford HVAC companies, A to Z
Filter by what each business says on its own website. “Says 24/7 emergency” means its site says so – call to confirm before you rely on it.
Your HVAC company, Hartford
The one City Spotlight place for Hartford sits here, above the A to Z list. Requests sent from this page for areas the Spotlight company serves go to it. Offered only to companies that pass our listing rules. How it works
Campbell Cooling, LLC
Based in Newington, CT · 109 Stamm Road, Newington, CT 06111
Names on its website: Avon, Berlin, Bloomfield, East Hartford, Farmington, Glastonbury, Hartford, Manchester, Rocky Hill, West Hartford and more
Charter Oak Mechanical
Based in Manchester, CT · 878 Hartford Road, Manchester, CT 06040
Names on its website: Glastonbury, Vernon, Newington
License number shown on its website: M-201874
Connecticut Cooling & Heating, Inc.
Based in Bloomfield, CT · 244 Woodland Ave, Bloomfield, CT 06002
Names on its website: Hartford, Farmington, Avon, Simsbury
Cromwell Energy, Inc.
Based in Cromwell, CT · 308 Main Street, Cromwell, CT 06416
Names on its website: Portland, Middletown, Rocky Hill, Berlin, Glastonbury, Wethersfield, West Hartford, Newington
Dynamic Heating, Cooling & Geothermal
Based in Plainville, CT · 230 S Washington Street Unit 26, Plainville, CT 06062
Names on its website: West Hartford, Avon, Berlin, Bloomfield, Farmington, Glastonbury, Manchester, Newington, Simsbury, Southington and more
License number shown on its website: S10393591
Fahrenheit Mechanical Services Inc
Based in Broad Brook, CT · 56 Depot St, Broad Brook, CT 06016
Names on its website: Avon, Bloomfield, East Windsor, Enfield, Farmington, Glastonbury, Hartford, Simsbury, South Windsor, Vernon and more
Foremost Mechanical Services
Based in South Windsor, CT
Names on its website: Bloomfield, East Hartford, East Windsor, Ellington, Hartford, Manchester, Tolland, Vernon, Windsor, Windsor Locks
License number shown on its website: HTG 0390286-S1
Future Mechanical LLC
Based in New Britain, CT
Names on its website: Berlin, Plainville, Southington, Farmington, Newington, Rocky Hill, Wethersfield
License number shown on its website: Fully licensed and insured HVAC contractor (no number shown)
Glastonbury Burner & Boiler
Based in Glastonbury, CT · 107 Oakwood Drive, Suite G, Glastonbury, CT 06033
Names on its website: Manchester, Hebron, East Hartford, Wethersfield, Rocky Hill, Marlborough, Portland, South Windsor
License number shown on its website: S1# 303405, SM1# 2955
Ideal Mechanical Services LLC
Based in Tolland, CT
Names on its website: Coventry, Hebron, Andover
License number shown on its website: P1-0286497; S1-0408345
Link Mechanical Services, Inc.
Based in New Britain, CT · 60 Production Ct, New Britain, CT 06051
Names on its website: Avon, Berlin, Bloomfield, East Hartford, Farmington, Glastonbury, Hartford, Manchester, Newington, Rocky Hill and more
License number shown on its website: S1-387433; P1-0204262; MEC-1149
Mid-State Mechanical Contractors
Based in Middletown, CT · 770 Newfield St, Middletown, CT
Names on its website: Berlin, Cromwell, Farmington, Glastonbury, East Hartford, West Hartford, Manchester, Newington, Portland, Rocky Hill and more
License number shown on its website: S-1 303210
Miller Oil Company
Based in Enfield, CT · 447 Enfield Street, Enfield, CT 06082
Names on its website: Bloomfield, Manchester, Simsbury, South Windsor, Vernon, Windsor
License number shown on its website: CT LIC. #303779, LIC# 385997, HOD# 141
N&T Heating, Cooling and Ventilation LLC
Based in Glastonbury, CT · 2389 Main St. Suite #002, Glastonbury, CT 06033
Names on its website: Avon, Bloomfield, East Hartford, Farmington, Hartford, Manchester, Newington, South Windsor, Vernon, West Hartford and more
License number shown on its website: HTG.0413582-S1; HIC 0703097
Sav-Mor Cooling & Heating, Inc.
Based in Southington, CT · 231 Captain Lewis Dr., Southington, CT 06489
Town Oil
Based in Wethersfield, CT · 786 Silas Deane Hwy, Wethersfield, CT 06109
Names on its website: Bloomfield, Newington, Hartford, Cromwell, Rocky Hill, Glastonbury, East Hartford, West Hartford, Manchester
TruComfort Heating & Cooling
Based in Southington, CT · 702 Curtis Street, Southington, CT 06489
Names on its website: Avon, Meriden, Cheshire, New Britain, Bristol, Farmington
Ugo Digrazia Heating & Cooling LLC
Based in Hartford, CT · 436 Franklin Ave, Hartford, CT 06114
Names on its website: Berlin, Bloomfield, Cromwell, East Hartford, Glastonbury, Manchester, Newington, Rocky Hill, West Hartford, Wethersfield
License number shown on its website: License 306632
Valley Air Conditioning & Heating, LLC
Based in Simsbury, CT · 129 West St, Simsbury, CT 06070
Names on its website: Avon, Bloomfield, Farmington, Granby, South Windsor, West Hartford, Windsor, Windsor Locks, East Granby, Canton and more
License number shown on its website: S1 – 412556
Wittig Mechanical LLC
Based in Ellington, CT · 3 Jobs Hill Rd, Ellington, CT 06029
Names on its website: East Windsor, Enfield, South Windsor, Suffield, Tolland, West Hartford, Windsor, Windsor Locks, Vernon
License number shown on its website: #0405273
Details on this page come from each business’s own website, checked October 2026. Free listings are shown alphabetically. How we list · Update or remove a listing
Before you hire
Checking an HVAC company in the Hartford area
HVAC licenses in Connecticut
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.
Questions to ask
Ask every company the same questions: license number, insurance, EPA refrigerant certification, a written itemized estimate, a load calculation for new equipment, after-hours rates, who pulls the permit, and the warranty. All eight questions.
Seasonal care
Getting through a Hartford winter
Heating season is the long one in Hartford, so the furnace, boiler or heat pump does most of the work. Start with these before the first cold snap – and keep carbon monoxide alarms working.
Questions
Hartford HVAC questions
How many HVAC companies are listed in Hartford?
20 HVAC companies, each based within about 25 miles of Hartford. They are listed alphabetically.
Which Hartford HVAC companies say they offer 24/7 emergency service?
10 of the businesses listed here say on their own website that they offer 24/7 or 24-hour emergency service: Charter Oak Mechanical, Cromwell Energy, Inc., Foremost Mechanical Services, Future Mechanical LLC, Glastonbury Burner & Boiler, Ideal Mechanical Services LLC, N&T Heating, Cooling and Ventilation LLC, TruComfort Heating & Cooling, Ugo Digrazia Heating & Cooling LLC, Wittig Mechanical LLC. Call to confirm availability and after-hours rates.
Do HVAC contractors in Hartford need a license?
Connecticut licenses HVAC contractors statewide through the Connecticut Department of Consumer Protection (State Board of Heating, Piping, Cooling and Sheet Metal Work Examiners). Check a license at elicense.ct.gov.
Which Hartford companies work on heat pumps?
13 of the listed businesses say on their own website that they install or repair heat pumps. Use the Heat pumps filter above the list.
Which HVAC companies here do commercial work?
16 of the listed businesses say on their own website that they work on commercial properties. Use the Commercial filter above the list.
Do technicians need EPA certification?
Yes: federal rules require technicians who handle refrigerant to hold EPA Section 608 certification, in every state. Ask any company you are considering.
Nearby metro areas: New York City, NY · Boston, MA · Providence, RI · Buffalo, NY · Albany, NY · Rochester, NY · Worcester, MA. All of Connecticut.
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Tell us the job and your ZIP code. We pass your request to listed companies that serve your area, and they contact you directly.
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.