How to check if an HVAC contractor is actually licensed in Connecticut (and Massachusetts)
Checking whether an HVAC contractor is licensed in Connecticut is easy. Checking the right registry is the part most homeowners get wrong, because a licensed HVAC company often will not appear in the one they are told to search.
Copy either number into the state lookup below. Everything on this page works on us as well as it works on the next quote you get.
Why the contractor registry will not list your licensed HVAC company
Most homeowners in Connecticut have heard the same advice: before you hire anyone, make sure they are a registered home improvement contractor. It is good advice for a deck builder or a kitchen remodeler. Applied to an HVAC company, it produces a false alarm.
Connecticut law exempts licensed tradespeople from home improvement contractor registration when they are working inside their own trade. Heating, piping and cooling contractors and journeypersons are named in that exemption alongside electricians, plumbers, architects and engineers. A legitimate, fully licensed HVAC contractor can be absent from the home improvement registry and be in complete compliance.
The reasoning is not a loophole. Home improvement registration is a registration, not a license. There is no exam and no experience requirement. A trade license is the opposite: an apprenticeship, a trade exam, time logged as a journeyperson, and a separate business and law exam before anyone can hold a contractor license and pull a permit. The state exempts the trades because it already holds them to a higher bar.
What this means for you. Searching the home improvement registry for an HVAC company and finding nothing tells you almost nothing. Search the license database instead. That is a different system, and it is the one that matters.
What a Connecticut HVAC license actually is
The Connecticut Department of Consumer Protection issues heating, piping and cooling licenses through the Heating, Piping, Cooling and Sheet Metal Examining Board. The letter and number combination on the license is not decoration. It tells you exactly what the holder is allowed to touch.
Unlimited heating, piping and cooling
S-1 is the unlimited contractor license. The holder may perform all heating, piping and cooling work defined in the statute, including sheet metal. S-2 is the journeyperson version: same scope of work, but only while employed by a licensed contractor.
Limited heating and piping
These cover piping for heating systems, boilers, condenser water and steam piping in air conditioning systems. They exclude sheet metal work and refrigeration. A limited license is not a lesser contractor, it is a narrower one.
Cooling, refrigeration and burners
D-1 covers limited warm air, air conditioning and refrigeration. D-3 covers cooling only. The B series covers oil and gas burner work. A company may carry several depending on what its technicians handle.
Two details do most of the work. Only a contractor level license can enter into a contract with you directly and pull the permit, no matter how skilled the journeyperson is. And trade licenses in Connecticut are issued to individuals, not companies, so when you search a business name you are really looking for the licensed person standing behind it.
How to run the Connecticut lookup
Connecticut's license data is public, free, and updated in real time. The Department of Consumer Protection treats it as a primary source of verification, which means the record you see is the record, not a copy of one.
Open the state portal. Go to elicense.ct.gov and choose Lookup a License. You do not need an account and there is no fee.
Use one or two fields, not all of them. This is the single most common mistake. The system narrows aggressively, so filling every box usually returns nothing. Start with a license number, or a last name, or a business name. Leading zeros are not required.
Leave the license type blank on the first pass. If you guess the wrong category you will get an empty result and assume the worst. Search broad, then narrow.
Scroll down. Results render below the form, not above it. An empty screen usually means you have not scrolled, not that the license does not exist.
Open Detail and read four things. Credential type, credential status, credential number, and expiration date. Active and unexpired is the answer you want. Anything else is worth a question before you sign.
Try it now. Enter 0398155 in the license number field. That is ours, and it is the fastest way to see what a clean result looks like before you run it on someone else.
Massachusetts splits the same job across three places
This is where homeowners in the Springfield, Chicopee and Holyoke corridor get stuck. Connecticut consolidates nearly everything into one portal. Massachusetts does not. Depending on the credential, you will end up in one of three separate systems, and none of them links to the others.
eLIPSE, for plumbers and gas fitters
The Board of State Examiners of Plumbers and Gas Fitters moved to the eLIPSE platform, along with sheet metal workers. Plumbing and gas fitting licenses are no longer searchable through the older ePLACE portal.
Check a license at Mass.govOPSI, for refrigeration and supervisors
The Office of Public Safety and Inspections handles refrigeration technicians, pipefitters, sprinkler fitters and the Construction Supervisor License. Different board, different lookup, same Mass.gov starting point.
The Contractor Hub, for HIC registration
Home improvement contractor registration is run by the Office of Consumer Affairs and Business Regulation through the MA Contractor Hub, searchable by business name or registration number.
Massachusetts also gives you a consumer protection Connecticut does not extend the same way. Registered home improvement contractors pay into a Guaranty Fund that can compensate a homeowner up to twenty five thousand dollars for an unpaid judgment against a contractor. Work performed by an unregistered contractor is not covered by it. Massachusetts law also requires a written contract for home improvement work over one thousand dollars, and the contractor's registration number has to appear on it.
The cross border catch. A Connecticut license authorizes work in Connecticut. It does not travel. If a company quotes you on a job in Hampden or Hampshire County, the credential you want to see is a Massachusetts one. Ours is MA PL #172086.
Run the checklist
Eight items. Check off what you have confirmed, and the readout at the bottom tells you where you stand. Nothing is saved or sent anywhere, so use it on every quote you collect.
Nothing confirmed yet
Start with the state lookup for whichever side of the border your home sits on. Most of these take under two minutes each.
What a license does not tell you
A license is a floor, not a ceiling. It confirms the state believes someone is qualified to do the work legally. It says nothing about whether they will size your system correctly, show up when they said they would, or clean up the basement on the way out. Four things sit outside the license record and are worth asking for directly.
Insurance, from the insurer. Ask for a certificate of insurance sent to you by the agency, listing you as certificate holder. A card photographed on a phone proves a policy existed on the day of the photo and nothing more.
Who is pulling the permit. Equipment replacement in most towns across Hartford and Tolland counties requires a permit and an inspection. If a quote is cheap because nobody intends to pull one, you inherit that problem at resale.
Refrigerant handling. Anyone working with refrigerant needs EPA Section 608 certification under federal law. That is separate from the state license and does not appear in the state lookup.
Who actually shows up. Ask whether the crew on your job is employed by the company or subcontracted. Neither answer is automatically wrong. Not getting a straight answer is.
If a rebate is involved, there is a second list to check
This one costs homeowners real money every year, and it has nothing to do with licensing. Connecticut's heat pump rebates through Energize CT require that the equipment be installed by a contractor participating in the Heat Pump Installer Network. A fully licensed, entirely legitimate HVAC contractor who is not in that network cannot get you the rebate. It is not reduced. It is unavailable.
Massachusetts runs its own parallel structure through Mass Save. Being licensed in a state and being enrolled in that state's incentive network are two separate facts, verified in two separate places. If the rebate is part of how you are affording the system, confirm the network enrollment before you sign, not after.
Where to confirm it. Energize CT publishes a Find a Contractor tool alongside its heat pump incentive requirements. Clean Climate HVAC is a member of both the Energize CT Heat Pump Installer Network and the Mass Save Heat Pump Installer Network.
Why we hand you the tools to check us
Clean Climate HVAC Inc. was founded in 2024. In this trade that makes us new, and we are quoting against companies whose signs have been on trucks in these towns since before some of our customers bought their houses. We cannot ask anyone to take our word for it on the strength of a long history, because we do not have one.
So we built the business around the things a homeowner can check in five minutes instead. Two state licenses. NATE certified technicians. Trane Comfort Specialist. Membership in both state heat pump installer networks. A 4.9 star rating across more than 180 Google reviews. None of that is a promise. All of it is a record, and records can be looked up by anyone who wants to.
A while back I read an honest breakdown of home services SEO that made an argument I have not been able to shake: for a contractor, trust is not the soft part of the business that sits next to the real work. It is the thing the real work is measured by, and no amount of advertising survives contact with a company that does not have it. That is true, and it cuts both ways.
Trust you cannot verify is just a claim with better lighting.
The work itself is unforgiving around here anyway. The valley is full of hot water baseboard, older homes in Enfield, Windsor and East Windsor were never built with ductwork, and half the conversations we have start with an oil or propane bill somebody is done paying. A cold snap in January decides whether a backup heat strategy was designed or guessed at. There is no version of this trade where a good sales pitch covers for a bad install.
Which is why the license numbers are at the top of this page instead of buried in the footer. Run them. Then run the next company's. Whatever you decide, you will be deciding on something real, and we would rather compete on that than on who has the older sign.
Frequently asked questions
No, not for work inside their trade. Connecticut exempts licensed heating, piping and cooling contractors and journeypersons from home improvement contractor registration when they are working in that trade, along with electricians, plumbers, architects and engineers. The trade license is the credential that governs the work, and it requires an apprenticeship, exams and documented journeyperson experience that home improvement registration does not. Verify the trade license at elicense.ct.gov rather than searching the home improvement registry.
S-1 is the unlimited heating, piping and cooling contractor license. The holder may perform all heating, piping and cooling work defined in the statute, including sheet metal, and may contract directly with homeowners and pull permits. S-2 is the journeyperson version. The scope of work is the same, but an S-2 may only perform it while employed by a licensed contractor. If the person quoting your job holds an S-2 and no contractor is standing behind the company, that is worth asking about.
No. Licensing is state by state, and a Connecticut credential authorizes work in Connecticut only. A company serving both sides of the border needs credentials in both states, and Massachusetts spreads them across three systems: the eLIPSE platform for plumbers, gas fitters and sheet metal workers, the Office of Public Safety and Inspections for refrigeration technicians and construction supervisors, and the MA Contractor Hub for home improvement contractor registration. Check the one that matches the work you are hiring for.
- Connecticut Department of Consumer Protection, license lookup and heating, piping and cooling license types and scope of work
- Connecticut General Statutes Sec. 20-428, exemption of licensed tradespeople from home improvement contractor registration
- Massachusetts Division of Occupational Licensure, Check a license
- Massachusetts Office of Consumer Affairs and Business Regulation, Home Improvement Contractor Program and Guaranty Fund
- Energize CT, residential heat pump incentive requirements
Run the checklist on us first
We install and service heating, cooling and plumbing systems across seventeen towns in northern Connecticut and western Massachusetts, and we are reachable around the clock. Look us up before you call, not after.