Sometimes.
Federal law puts one credential on the refrigerant side of HVAC work — EPA Section 608 certification, with a closely supervised exemption for apprentices — and that credential is a certification, not a state license.
Whether you also need your own license is set by state and city law: New Jersey lets unlicensed technicians work as W-2 employees of a licensed HVACR business, and Kentucky's exemption stops where contracting on your own begins.
When you can work without your own license
Whether you need your own license is a question of whose license covers the work.
New Jersey's HVACR rules say work a master HVACR contractor has not subcontracted may be done only by the master or by W-2 employees of the master or the HVACR business — which is why an unlicensed technician can work legally there as a W-2 employee of a licensed business.
Kentucky's law exempts a different slice of the workforce: employees of a master heating, ventilation and air conditioning contractor who are subordinates of the licensee — not journeymen or apprentices — and who do not contract on their own, are exempt from Kentucky's HVAC licensing law.
The New Jersey HVAC license rules are on the state page.
The helper route has a federal floor of its own.
EPA's refrigerant rules exempt apprentices from 608 certification — but only while they are closely and continually supervised by a certified technician, and the supervising technician and the apprentice share responsibility for compliance.
The federal rule sets no time limit on that exemption.
That is the honest answer to "how long can you do HVAC work without a license" at the federal level: as long as the supervision lasts, there is no clock.
Whether your state adds a registration of its own on top is a separate question — the HVAC apprentice license and registration guide covers that layer.
Kentucky's exemption is written for employees who do not contract on their own — step outside an employer's license and bid work under your own name, and the exemption no longer covers you.
What applies then is the license layer: a 608 card does not substitute for it, because EPA 608 is a federal certification for refrigerant handling, not a state HVAC license, and it does not, by itself, authorize HVAC contracting.
Which states license HVAC workers, at which level, and what each rung allows is the license guide's question — start with the HVAC license requirements overview.
When EPA 608 is the only requirement
EPA Section 608 is the federal layer underneath all of this.
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 — HFCs included — must pass an exam from an EPA-approved technician certification program.
The requirement follows the refrigerant, not the state line.
Which certification you need depends on the equipment.
Type I covers maintaining, servicing or repairing small appliances.
Type II covers medium-, high- and very-high-pressure appliances (except small appliances, MVACs and MVAC-like appliances) — the type that covers residential split-system AC and heat pumps.
Type III covers low-pressure appliances, such as chillers using R-11, R-123, R-113 or R-245fa.
Universal covers all of the appliance types the other three describe.
For the test itself, see the EPA 608 certification guide.
And it stays earned.
EPA 608 certification does not expire, and the familiar myths are false under current rules: there is no two-year apprentice restriction on Type I, and EPA does not issue the card — the certifying organization issues and replaces it.
EPA's AIM Act FAQ also answers "No" to whether technicians certified under 608 or 609 need to be re-certified.
The trade's other credentials — NATE, HVAC Excellence, NCCER, ASSE certifications, OSHA 10/30 cards — are voluntary industry credentials, not government licenses, though a state or utility can mandate one — ASSE certifications, for example — where its rules call for it.
So when is 608 the only requirement?
For the stationary-refrigerant work this page covers, it is the credential the federal rules require — and it is not a state HVAC license: holding it does not, by itself, authorize contracting.
What your state or city adds on top of it is the question the license layer answers; for the two words side by side, see how a certification differs from a license.
Buying refrigerant and equipment
Refrigerant is where a federal rule reaches the counter.
Only EPA-certified technicians may buy ozone-depleting or substitute refrigerants such as HFCs, with limited exceptions — Section 608 certification for stationary refrigerants, Section 609 for motor-vehicle AC refrigerant.
The employer exception matters at a shop: a company may buy refrigerant if it gives the wholesaler written evidence that it employs at least one certified technician.
Two boundaries trip people up.
A 609 card does not let you buy refrigerant intended for stationary equipment, regardless of container size.
And the restriction covers refrigerant itself, not hardware: the sales restriction does not cover refrigeration and air-conditioning equipment or components that already contain refrigerant.
The small-can exception covers motor-vehicle refrigerant — cans of 2 lb or less with a self-sealing valve, which may still be sold to uncertified DIYers — not refrigerant for stationary equipment.
The equipment purchase itself is not the federal test — what you may lawfully do with it afterwards is.
Installing or connecting that equipment can call for a license or a permit, and which authority requires it is part of the same state and local licensing layer this page keeps pointing to.
Ask the state licensing board — or the city or county office that handles permits — before the purchase, not after the first service call.
Penalties for unlicensed HVAC work
EPA's penalties attach to the refrigerant rules, not to the license question.
The license layer belongs to the state, or to the city or county that does the licensing there, so the penalty for working without it is written into the same state or local law — and one state shows the shape: in Nevada, unlicensed contracting is a crime, a misdemeanor on a first offense carrying a fine of up to $1,000 and up to 6 months in jail, becoming a category E felony by the third offense.
The federal exposure is separate, and it is about refrigerant.
Under EPA's inflation-adjustment table, for penalties assessed on or after January 8, 2025, the maximum civil penalty under Clean Air Act §113(b) is $124,426 per violation.
EPA can also require technicians to demonstrate at their place of business that they can properly recover and recycle refrigerant, and it may suspend or revoke a certification for failing that demonstration or for breaking the Subpart F rules.
The refrigerant rules carry federal penalties of their own, on top of whatever the state does about licensing.
A handyman exemption is not automatically a way in for HVAC work, either.
Nevada's under-$1,000 exemption does not cover work of the type heating and air-conditioning contractors perform, regardless of job size, and Arizona's applies only to casual or minor work under $1,000 in aggregate contract price that does not require a local building permit.
New Jersey's and Kentucky's rules share one setting: employment.
New Jersey's HVACR work flows through the master HVACR contractor to W-2 employees, and Kentucky's exemption covers subordinate employees of a master HVAC contractor.
When you are ready to look for that kind of spot, browse HVAC technician jobs and read what contractors in your market ask for.
This page is career information, not legal advice. EPA certification rules are federal; licensing requirements and penalties come from your state or local board. Confirm each with the authority that issues it before you act on it.
Rules change — confirm with the board