HVAC Licensing Requirements by State: The Complete 50-State Directory
Updated July 2026 · HVACListing.com Editorial · 15 min read
The short answer
About two out of three US states require HVAC contractors to hold a statewide license. The rest license through combined mechanical or building trade authorities, delegate to city and county governments, or exempt small-scope work. In every state, anyone handling refrigerant must additionally hold federal EPA Section 608 certification — a person-level credential, not a company license.
Before hiring any HVAC contractor: (1) confirm state or local license, (2) confirm EPA 608 certification for refrigerant work, (3) confirm general liability and workers' comp insurance.
What "is my contractor licensed?" actually means
Homeowners often ask this as one question — it's actually three:
| Question | What to check | Where to check |
|---|---|---|
| Does the state license this work? | State contractor / mechanical board | State agency table below |
| Does the city or county also require a permit or local license? | Local building department | Your local government portal |
| Is the technician handling refrigerant federally certified? | EPA Section 608 card | Ask to see the card — issued by an EPA-approved testing organization |
A contractor can be legitimately unlicensed at the state level (because their state doesn't require it) and still be operating correctly — provided local jurisdiction and EPA rules are met. Equally, a contractor can carry a state license but lack an EPA 608-certified tech on the truck. Both checks matter.
The federal baseline: EPA Section 608
The Clean Air Act, Section 608, requires anyone who maintains, services, repairs, or disposes of equipment that could release regulated refrigerants to hold EPA 608 certification. This applies in all 50 states regardless of state licensing rules.
There are four certification types:
- Type I — small appliances (window units, most residential mini-splits under certain charge thresholds)
- Type II — high-pressure appliances (most residential central AC and heat pumps)
- Type III — low-pressure appliances (rare in residential; centrifugal chillers)
- Universal — all three types
For residential HVAC repair or replacement, you want a technician with at least Type II or Universal certification. Ask to see the card — it doesn't expire. Certification is issued to the individual, not the company. The EPA maintains a list of approved certifying organizations at epa.gov/section608.
HVAC Licensing by State — At a Glance
Always verify current requirements with the linked agency at hire time. Licensing laws change; this table reflects requirements as of July 2026.
| State | State License Required? | Primary Licensing Agency | Key Notes |
|---|---|---|---|
| Alabama | Yes (projects over $50,000) | Alabama Board of Heating, Air Conditioning and Refrigeration Contractors | Certified vs. registered classes |
| Alaska | Yes | Alaska Dept. of Commerce, Community, and Economic Development | Mechanical Administrator license required |
| Arizona | Yes | Arizona Registrar of Contractors (ROC) | K-39, C-39, CR-39 classifications |
| Arkansas | Yes | Arkansas HVACR Licensing Board | Class A, B, and specialty licenses |
| California | Yes | Contractors State License Board (CSLB) | C-20 Warm-Air Heating, Ventilating and Air-Conditioning |
| Colorado | Local only | Local building departments; state handles plumbing/electrical separately | Denver, Aurora, Colorado Springs each run their own licensing |
| Connecticut | Yes | Connecticut Dept. of Consumer Protection | S1, S2, D1, D2 heating/cooling classifications |
| Delaware | Yes | Delaware Div. of Professional Regulation | Master HVACR license |
| Florida | Yes | Florida Dept. of Business & Professional Regulation (DBPR) | Class A (unlimited) and Class B (limited scope) |
| Georgia | Yes | Georgia State Construction Industry Licensing Board — Conditioned Air Contractors Division | Class I (under 175K BTU) and Class II (unlimited) |
| Hawaii | Yes | Hawaii Contractors License Board | C-52 Ventilating and Air Conditioning |
| Idaho | Yes | Idaho Div. of Building Safety, HVAC Program | Journeyman, Contractor, Specialty tiers |
| Illinois | Local only | City / county building departments | Chicago has its own robust requirement; check locally |
| Indiana | Local only | City / county building departments | State licenses plumbing separately |
| Iowa | Yes | Iowa Div. of Labor, HVAC/Refrigeration Program | Master, Journeyman, Apprentice structure |
| Kansas | Local only | City / county | State offers voluntary technician certification only |
| Kentucky | Yes | Kentucky Dept. of Housing, Buildings and Construction | Master HVAC Mechanic Contractor license |
| Louisiana | Yes (projects over $10,000) | Louisiana State Licensing Board for Contractors | Mechanical Work classification |
| Maine | Yes (split) | Maine Oil & Solid Fuel Board (heat); separate refrigeration rules | Split responsibilities by fuel type |
| Maryland | Yes | Maryland Dept. of Labor, HVACR Contractors | Master, Limited, Journeyman, Apprentice tiers |
| Massachusetts | Yes (refrigeration) | Massachusetts Div. of Occupational Licensure | Refrigeration Technician license |
| Michigan | Yes | Michigan Dept. of Licensing and Regulatory Affairs (LARA) | Mechanical contractor + classifications |
| Minnesota | Yes | Minnesota Dept. of Labor and Industry | Refrigeration licensed separately |
| Mississippi | Yes (projects over $50,000) | Mississippi State Board of Contractors | Mechanical classification |
| Missouri | Local only | City / county | Kansas City and St. Louis have their own requirements |
| Montana | Local only (registration) | Montana Dept. of Labor & Industry registers contractors; local jurisdictions license trades | State registration + local trade rules |
| Nebraska | Local only | Local jurisdictions | Omaha and Lincoln have their own licensing |
| Nevada | Yes | Nevada State Contractors Board | C-21 Refrigeration and Air Conditioning |
| New Hampshire | Yes (partial) | NH Office of Professional Licensure and Certification | Gas fitter and electrician licenses cover relevant portions |
| New Jersey | Yes | New Jersey Div. of Consumer Affairs, HVACR Board | Master HVACR Contractor license |
| New Mexico | Yes | New Mexico Regulation and Licensing Dept. | MM-1, MM-2, MM-98 classifications |
| New York | Local only | City / county | NYC has its own licensing; Nassau, Suffolk, Westchester vary |
| North Carolina | Yes | NC State Board of Examiners of Plumbing, Heating and Fire Sprinkler Contractors | Limited, Intermediate, and Unlimited classes |
| North Dakota | Yes (registration) | North Dakota Secretary of State + local | Contractor registration + local trade rules |
| Ohio | Yes | Ohio Construction Industry Licensing Board (OCILB) | HVAC Contractor license |
| Oklahoma | Yes | Oklahoma Construction Industries Board | Mechanical Contractor license |
| Oregon | Yes | Oregon Construction Contractors Board + Building Codes Div. | Contractor registration + trade licenses |
| Pennsylvania | Local + state registration | PA Attorney General (Home Improvement Contractor) + local jurisdictions | PA HIC registration required for residential; no statewide HVAC license |
| Rhode Island | Yes | Rhode Island Dept. of Labor and Training | Refrigeration/AC contractor license |
| South Carolina | Yes | SC Dept. of Labor, Licensing and Regulation | Mechanical Contractor license |
| South Dakota | Local only | Local jurisdictions | Sioux Falls has its own requirements |
| Tennessee | Yes (projects over $25,000) | Tennessee Board for Licensing Contractors | Mechanical (CMC) classification |
| Texas | Yes | Texas Dept. of Licensing and Regulation (TDLR) — Air Conditioning and Refrigeration | Class A (unlimited) and Class B (under 25 tons / 1.5M BTU) |
| Utah | Yes | Utah Div. of Occupational and Professional Licensing (DOPL) | S350 HVACR license |
| Vermont | Yes | Vermont Office of Professional Regulation | Gas / oil / propane trades licensed |
| Virginia | Yes | Virginia Dept. of Professional and Occupational Regulation (DPOR) | HVAC Class A, B, or C |
| Washington | Yes | Washington Dept. of Labor & Industries | Electrical + HVAC/R specialty license |
| West Virginia | Yes | West Virginia Div. of Labor | HVAC Technician license |
| Wisconsin | Yes | Wisconsin Dept. of Safety and Professional Services (DSPS) | HVAC contractor registration + technician credentials |
| Wyoming | Local only | Local jurisdictions | Contractor registration through Secretary of State; trades licensed locally |
"Yes" = state agency runs a program covering most HVAC work. "Local only" = state does not license HVAC at the state level; verify with your city or county. "Yes (over $X)" = state threshold applies; below that threshold, only local rules apply. Verify current status before hiring.
How to verify an HVAC contractor's license (4 steps)
- 1
Ask for the license number.
A licensed contractor provides it without hesitation. It should appear on the contract, the invoice, and often on the truck or business card.
- 2
Look up the number on the state or local agency portal.
Confirm: name on the license matches the business you're hiring; status is "active" (not expired, suspended, or lapsed); classification covers the scope of work; no open disciplinary actions.
- 3
Confirm EPA 608 for the individual tech handling refrigerant.
Ask the technician who will do the work to show their EPA 608 card. At minimum Type II or Universal for residential central AC or heat pump work.
- 4
Verify insurance and bonding.
Ask for a certificate of insurance (COI) covering general liability and — if they employ workers — workers' compensation. The COI should name your address as additional insured for the job.
Three common myths about HVAC licensing
Myth 1: "If a state doesn't require a license, anyone can legally do the work."
Not quite. States without statewide HVAC licenses — Illinois, Indiana, Missouri, New York, and others — still have local licensing, permit requirements, and federal EPA 608 rules. Unlicensed at the state level does not mean unregulated.
Myth 2: "A general contractor's license covers HVAC work."
Usually not. Most states treat HVAC as a specialty trade separate from general contracting. A licensed GC can coordinate the project, but the actual mechanical work must be done under an HVAC-specific license.
Myth 3: "A city permit proves the contractor is licensed."
The permit confirms someone pulled a permit — not that the person doing the work is licensed. In many jurisdictions, a homeowner can pull a permit, which shifts liability entirely to the homeowner. Verify the license separately.
What "licensed" doesn't tell you
A license is a floor, not a ceiling. It confirms the contractor met minimum standards for education, experience, and testing. It does not tell you:
- Whether they show up on time or return calls three months later
- Whether their pricing is fair for your market
- Whether their labor warranty is enforceable in practice
- Whether the tech on the truck is skilled or an apprentice on their second day
For those factors, rely on reviews, references, and your own vetting. See our 12-point contractor hiring checklist for the full process.
Frequently Asked Questions
- Do I need to check the HVAC license every time I hire a contractor?
- Yes. State licenses can lapse, expire, or be suspended. A three-minute lookup on the state agency site protects you from a contractor who was licensed last year but is not today.
- Is EPA 608 the same as a state HVAC license?
- No. EPA Section 608 is a federal certification held by the individual technician for handling refrigerant. A state HVAC license is issued to a business or master contractor. Both matter; neither substitutes for the other.
- What if my state doesn't require a state HVAC license?
- Check your city and county building departments. In states without statewide HVAC licensing — such as Illinois, Indiana, Missouri, and New York — licensing is handled at the local level. Federal EPA 608 rules still apply everywhere for refrigerant work.
- Can I do HVAC work on my own home?
- In most jurisdictions, homeowners can perform work on their own primary residence, but must pull the permit personally, pass inspection, and assume full liability. Refrigerant work still requires EPA 608. Unpermitted work is a common disclosure issue at home sale.
- How do I verify an HVAC contractor is actually licensed?
- Ask for the license number. Look it up on the state agency site for your state. Confirm the status is active, the name matches the business you're hiring, and the classification covers your type of work. Any contractor who resists sharing a license number is a red flag.
- Does a general contractor's license cover HVAC work?
- Usually not. Most states treat HVAC as a specialty trade separate from general contracting. The actual mechanical work typically must be performed under an HVAC-specific license or by a licensed HVAC subcontractor.
- Does the contractor license cover the technician who shows up at my house?
- The license covers the business's authorization to do the work. Whether the individual on the job is a licensed journeyman, an apprentice, or a helper varies. For refrigerant work specifically, that individual must hold EPA 608 certification personally.
Find licensed HVAC contractors in your city
HVACListing.com lists HVAC contractors across major U.S. cities. License information is shown as provided by each contractor.
State-specific licensing guides
- California HVAC License Requirements: C-20, Title 24, and HERS Verification
- Texas HVAC License Requirements: TDLR ACR Technician and Contractor Registration
- Georgia HVAC License Requirements: Conditioned Air Contractor Classes I, II, and III
- Florida HVAC License Requirements: Certified vs. Registered Contractors
- Colorado HVAC License Requirements: Local Licensing and State Certification
Related guides
This guide is provided for general informational purposes and is not legal advice. Licensing requirements change; always verify current rules with the listed state or local agency before making a hiring decision. HVACListing.com does not license or certify contractors.