What licenses do you need to start an HVAC business?

The two layers answer different questions, at different counters.

The contractor licence is the trade permission — who may contract for HVAC work — and it is the layer that state boards and cities attach bonds and insurance to.

A general business licence or registration is a different question: a jurisdiction's permission to operate a business there at all.

This page's research covers the trade-licence layer; the entity and tax registrations sit with other agencies, and the section below keeps them separate.

Where the state issues a contractor licence in defined classes, the classification names are the first thing to check.

Florida licenses air-conditioning contractors through the Construction Industry Licensing Board of the Department of Business and Professional Regulation, and anyone contracting must be certified (statewide) or registered (local) in the proper classification.

Texas issues air-conditioning and refrigeration contractor licences in two classes: Class A (any size equipment) and Class B (up to 25 tons cooling or 1.5 million BTU/hour heating).

Arizona's ROC splits HVAC into commercial (C-39), residential (R-39) and dual classes, with C-49 covering commercial refrigeration and further classifications that include solar.

In a second group of states, the licence that matters is held by an individual at the master level, and the business works through that person: for HVAC, the master-level individual licence doubles as the contracting licence in Maryland, Delaware, New Jersey (through a bona fide representative), Kentucky (master HVAC contractor), Connecticut and Rhode Island.

New Jersey's statewide HVACR licence exists only at the master level — the Master HVACR contractor licence issued by the State Board of Examiners of Heating, Ventilating, Air Conditioning and Refrigeration Contractors — and an HVACR business there operates through a licensed master as its bona fide representative, and the business must hold a pressure seal to pull HVACR permits.

Kentucky licenses the trade statewide through the Department of Housing, Buildings and Construction: master HVAC contractor licences, journeyman HVAC mechanic licences and apprentice HVAC mechanic certificates.

The pattern has teeth in the details.

Connecticut's contractor licences (S-1, D-1 and similar) are held by the individual, and journeypersons such as B-4 must work in the employ of a licensed contractor.

Delaware requires an HVAC business to have a Master HVACR (or restricted) licensee supervising its workers, and unlicensed employees may only do HVACR work under a master who is their employer or works full time for the same business.

Rhode Island is a worked example: only licensed masters may run a mechanical-trades business, and the master licence number must appear on ads, contracts, bids and permits.

Maryland runs the same pattern with no company licence at all — contracting is done under an individual Master, Master Restricted or Limited HVACR licence.

In a third group there is no state HVAC contractor licence to apply for.

As of September 2026, Illinois, Indiana, Kansas and Missouri have no statewide HVAC contractor licence — licensing is local — Minnesota requires only a state mechanical-contractor bond filing plus local licences, and Montana requires only a general Construction Contractor License, with no trade exam.

The Illinois and Indiana absences are verified negatives: the Illinois Department of Financial and Professional Regulation's list of regulated professions includes no HVAC, heating, mechanical or refrigeration licence, and the Indiana Professional Licensing Agency's list includes no HVAC board.

Kansas sets no state licence, bond or insurance amount for the trade — any contractor requirements come from the local jurisdiction — and Missouri has no state licence, bond or exam either, with its contractor requirements set by each city or county: Kansas City requires a qualified individual's Certificate of Qualification before it issues a business Contractor License.

Indianapolis, for its part, states that HVAC licensing in Indiana is at the discretion of the local municipality.

Minnesota and Montana show how thin a state layer can be without being absent.

Minnesota businesses must file a $25,000 mechanical contractor bond with the Department of Labor and Industry to contract for gas, heating, ventilation, cooling, air conditioning, fuel-burning or refrigeration work — the filing costs $100 and is valid two years — while qualifier, exam and insurance rules are set by cities, not the state.

Montana's Construction Contractor License, required since January 1, 2026, lists no trade exam, qualifier or bond requirement; licensees must report ownership, name or officer changes within 30 days.

Our research also turned up states that appear to have no state HVAC contractor licence — Colorado, Nebraska, New York, North Dakota (a general Secretary of State licence only), Pennsylvania, South Dakota, Wyoming, Vermont and Maine — but the absence is not affirmatively sourced in every case, so we treat those as questions for the board rather than conclusions.

Where the state has no licence to apply for, the requirements are the city's or county's to set: ask the local licensing office what a contracting business needs before you bid.

Licensing is often local, and rules change.

Confirm the current requirement with the state board — or with the city or county where licensing is local — before you bid your first job.

The state-by-state rundown — which boards license the trade, which classes exist, what the exams and bonds are — is its own subject: our HVAC contractor license guide runs it, with a 51-state table.

Who may stand behind a company licence, whether one person can qualify two businesses, and what you file when that person leaves is the machinery of the HVAC contractor license qualifier — our guide covers that too.

EPA 608 is a federal technician certification, not a business licence — the one credential on this page that is neither state nor local.

Under 40 CFR 82.161, any person who could reasonably be expected to violate the integrity of the refrigerant circuit while maintaining, servicing, repairing or disposing of appliances containing CFC/HCFC or non-exempt substitute refrigerants (such as HFCs) must pass an exam from an EPA-approved technician certification program.

It certifies people, not companies — a different question from the licence layers above.

The certification comes in types.

Type I certification is required to maintain, service or repair small appliances — ones fully manufactured, charged and hermetically sealed in a factory with 5 pounds or less of refrigerant, such as window ACs and PTACs.

Type II covers maintaining, servicing, repairing or disposing of medium-, high- or very-high-pressure appliances — except small appliances, MVACs and MVAC-like appliances — and is the type that covers residential split-system AC and heat pumps.

Type III covers maintaining, servicing, repairing or disposing of low-pressure appliances, such as chillers, and Universal covers all appliance types described for Types I, II and III.

The "on staff" question is really a purchasing question.

Only EPA-certified technicians — Section 608 for stationary refrigerants, 609 for motor-vehicle air-conditioning refrigerant — may buy ozone-depleting or substitute refrigerants such as HFCs, with limited exceptions.

One of those exceptions is the employer: a company may buy if it gives the wholesaler written evidence that it employs at least one certified technician.

A shop that wants refrigerant on its own account therefore needs a certified technician behind the purchase.

Two enforcement details land at the place of business as well.

Certified technicians must keep a copy of their certificate at their place of business, and keep it until three years after they stop working as a technician.

EPA may also require a technician to show at the place of business that they can properly recover and recycle refrigerant, and may suspend or revoke a certificate for failing to do so or for breaking Subpart F.

The cards themselves come from the certifying organization — EPA does not issue or replace them.

How to check a card is its own subject: see our guide to verifying a technician's EPA 608 card.

The wider employer duties around leaks, records and purchased refrigerant are covered in our guide to EPA 608 employer duties.

One credential does not answer the other question.

EPA 608 covers who may work on a refrigerant circuit and who may buy regulated refrigerant; the contractor licence covers who may contract for the work.

You will deal with both — EPA's program for the certification, the state board or city for the licence — so confirm the current federal requirements with EPA's rules for your work before you buy refrigerant or bid it.

Be precise about which layer each registration belongs to.

The licence layers above are administered by state boards and city offices.

Forming the company, federal tax identification and state sales-tax registration where it applies are separate tracks at their own agencies — the offices to ask include your Secretary of State, the IRS and your state's revenue department.

Our research for this page verified the licence layers, not those registrations, so we make no claim about their requirements — confirm each one with the agency that runs it.

The registrations we can speak to are the ones boards attach to the licence itself: bonds and liability insurance.

California requires a $25,000 contractor bond, plus a $25,000 bond from a non-owner qualifier; Alabama's HACR bond is $20,000; New Jersey's bond is $3,000.

Maryland skips the bond and runs on insurance instead — $300,000 general liability and $100,000 property damage minimums, for licensees who sign or approve contracts, with the HVACR Board named as certificate holder.

Minnesota's $25,000 mechanical-contractor bond is filed with the Department of Labor and Industry for a company to contract for that work.

As for order, it pays to settle the licence question first, because it decides what else you must register.

Where the licence belongs to a master-level individual, the business contracts through that person's licence, so finding them comes first.

Where the state issues the contractor licence, the bonds and insurance amounts are the licensing authority's to set — the examples above.

The entity and tax accounts run in parallel at their own agencies; sequence them with your accountant or attorney, and confirm each agency's current requirements with it.

One caution from the research: do not assume a state bond or insurance minimum exists where the licence is local.

Kansas sets no state licence, bond or insurance amount, and Missouri has no state licence, bond or exam — the contractor requirements in both are set by each city or county.

In Minnesota the qualifier, exam and insurance rules are the cities', not the state's.

For Illinois and Indiana, the other two states with no state HVAC contractor licence, our research did not verify state bond minimums either way — ask the office that will issue your licence before you budget.

Amounts and forms change.

Our contractor license bonds and insurance guide collects the verified examples by state; for your own filing, confirm the current amount and form with the board or city that will issue it.

Run the layers in the order you will meet them.

Identify the issuer first — the state board, or the city or county where licensing is local — because every other step hangs on what that office requires.

Settle the qualifier question next: whether you will hold the master-level licence yourself or bring in someone who does.

Then the company registrations: the bond and insurance the board or city attaches, and the entity and tax accounts at their own agencies.

Put EPA 608 on the staffing list early: the company's purchases run on the employer exception — written evidence to the wholesaler that it employs at least one certified technician.

Finally, calendar every renewal — including the individual licence where it is the licence the business stands on.

The checklist below is the business's stack.

Your future techs carry their own credentials, and what a hire needs is a different question from what the business needs — our guide to what license your hire needs separates the two, and the plumbing version of this page lives in our plumbing business license guide.

Once the licensing stack is mapped, the growth side is people: our guide to hiring HVAC and plumbing techs covers sourcing, pay plans and screening — and when you want to see what candidates see, start at HVAC technician jobs.

This page is employer career and business information, not legal advice. Licensing requirements are set by each state's board — or by your city or county where licensing is local — and the federal refrigerant rules by EPA. Confirm every requirement above with the issuing body before you bid or advertise.