HVAC License Requirements by State: Technician Rules, Contractor Classes and Size Limits

Do you need a license to work on HVAC systems?

Almost everywhere you need two things. The first is federal: EPA Section 608 certification to buy and handle refrigerant (see our EPA 608 guide). The second is whatever your state requires, which can be a technician registration, a contractor license, or both. States differ most on whether they license the individual tech at all.

HVAC licensing compared by state

Why do HVAC licenses have tonnage limits?

Because the risk and complexity rise with system size, many states let you start with a smaller-scope license. Texas Class B covers cooling systems of 25 tons and under (TDLR). Florida Class B is limited to 25 tons of cooling and 500,000 BTU of heating in any one system (CILB). North Carolina draws the line at 15 tons between Heating Group 3 and Group 2, and counts every single-family residence system as Group 3 "regardless of size" (G.S. 87-21). For a residential service company, the smaller license usually covers everything you'll touch.

Which states license HVAC technicians?

Of these four, Texas is the only one with a statewide credential for helpers: anyone assisting a licensed ACR contractor on maintenance or repair must register with TDLR (TDLR). Florida lets counties issue HVAC journeyman licenses after a state-approved apprenticeship or 12,000 hours of on-the-job training, and requires other Florida localities to recognize them (Fla. Stat. 489.1455). North Carolina issues technician licenses for people working under a contractor. California's state-level HVAC license is the C-20 contractor license; we found no separate technician license on CSLB.

Who can install a heat pump?

Heat pumps are pushing this question into every state. In California, CSLB says HVAC system heat pumps fall under the C-20, while heat pump water heaters can go to a C-20 or a C-36 plumber; a C-10 electrician can upgrade the panel but can't contract for the heat pump itself (details on our California HVAC page). Other boards describe scope in their own words, so read your state's classification text before you bid a heat pump job on a license you hold for something else. When a job crosses trades, the electrical and plumbing tie-ins may need their own licensed contractor.

How to get an HVAC contractor license

1. Get EPA 608 certified; try our EPA 608 Core practice test.
2. Register as a technician if your state requires it.
3. Log supervised experience: 2 to 4 years depending on the state.
4. Pass the state's trade and business exams.
5. Meet insurance, bond and workers' comp rules. California C-20 contractors can't file a workers' comp exemption (CSLB).
6. Set up the business: how to start an HVAC business and the HVAC trade guide.

If you're thinking past the license to the shop, the gap is usually phones and scheduling, not technical skill. See electrician licensing by state and plumbing licensing by state if you'll hire across trades.