How to Verify an HVAC License: CA, TX, and WA

Learning how to verify an HVAC license means checking three records, not one: the business that contracts for the work, the individual who performs it, and, wherever refrigerant is involved, the federal EPA 608 certification. In California, Texas, and Washington those records live in different databases, use different names for the same tiers, and expire on different cycles. A contractor can hold a valid business license while the technician on site lacks the certification for the refrigerant circuit. This guide walks through the lookup in each state and lists the checks that matter before you hire, onboard, or pay.

Last reviewed November 4, 2026. This is an operational guide, not legal advice. Confirm requirements with the state board before you sign a contract.

What are you actually verifying when you check an HVAC contractor?

Four things, in order: legal authority, scope, refrigerant authority, and financial backing. That is, an active license or registration covering HVAC work in that state, a credential matching the work held by the individual on the job, EPA 608 certification for the equipment type, and bond or insurance in force under the same business name as your contract. Most bad hires fail on scope or refrigerant authority. The lookups below take about two minutes each and are free.

How do you verify an HVAC license in California?

California licenses the business through the Contractors State License Board (CSLB). HVAC work falls under the C-20 Warm-Air Heating, Ventilating, and Air-Conditioning classification, covering installation, maintenance, and repair of heating, ventilating, air-conditioning, and evaporative cooling systems, including ductwork and controls.

Start at the CSLB Check a License tool: cslb.ca.gov/onlineservices/checklicenseII/checklicense.aspx. Search by license number, business name, or qualifier name. Confirm C-20 appears in the classification list, the status reads Active, and the $25,000 contractor bond is on file. Then check workers' compensation: C-20 must carry it even with no employees, so an exemption on a C-20 record deserves a second look.

California does not license individual HVAC technicians at the state level, so the business record plus EPA 608 certification (below) is the complete check. A general building contractor (Class B) may take an HVAC job only if it also holds C-20 or subcontracts the HVAC work to a C-20 holder.

How do you verify an HVAC license in Texas?

One agency covers both sides in Texas. The Texas Department of Licensing and Regulation (TDLR) licenses air conditioning and refrigeration (ACR) contractors and registers ACR technicians, and its free license search covers both: tdlr.texas.gov/LicenseSearch. Search by license number, business name, or individual name, and run the business record and the technician record separately.

The business license is the ACR Contractor license, and it comes in two classes:

• Class A: work on systems of any size.
• Class B: cooling systems up to 25 tons and heating up to 1.5 million BTU per hour.

Applicants need 48 months of practical experience under a licensed ACR contractor, or a technician certificate plus 36 months of experience, and must pass the exam. The application fee is $115 and the license renews annually. Insurance minimums, per occurrence / aggregate / products and completed operations, are $300,000 / $600,000 / $300,000 for Class A and $100,000 / $200,000 / $100,000 for Class B.

The individual side is the ACR Technician registration: a technician must work under the general supervision of a licensed ACR contractor. The common Texas mistake is accepting a technician registration as a business license. Confirm the business record is active, the class covers the system size, and the insurance certificate names the same business as the license.

How do you verify an HVAC license in Washington?

Washington does not issue a standalone "HVAC license" for individual technicians. Instead, an HVAC business registers as a contractor with the Department of Labor and Industries (L&I), and the electrical and refrigerant pieces of the job carry their own credentials on top of that registration.

Start with L&I's Verify a Contractor, Tradesperson or Business service, which surfaces registration status, bond, insurance, workers' compensation, and trade credentials. Look for the HVAC/Refrigeration specialty registration: specialty contractors carry a $15,000 bond and pay a $141.10 registration fee on a two-year cycle. An active general registration alone does not prove HVAC specialty coverage.

Then check the electrical piece. Connecting a unit to an existing circuit requires a 07 HVAC/Refrigeration electrician certificate or higher, while installing a new circuit requires a 01 journey-level electrician. Low-voltage thermostat wiring under 24 volts is exempt. Verify the electrical credential in the same L&I record, and confirm EPA 608 certification for anyone handling refrigerant.

What is EPA 608 certification, and how do you check it?

EPA Section 608 of the Clean Air Act is federal law, applying identically in all 50 states. Anyone who maintains, services, repairs, or disposes of equipment that could release refrigerant must hold EPA 608 certification. It is about the refrigerant circuit, not the job title: hooking up gauges, charging or recovering refrigerant, and cutting into a refrigerant line all count. Motor vehicle air conditioning is a separate program (Section 609).

There are four types, and the type must match the equipment:

• Type I: small appliances, factory-sealed systems with 5 pounds of refrigerant or less.
• Type II: high-pressure appliances, covering most residential and light commercial air conditioning and heat pumps.
• Type III: low-pressure appliances, such as centrifugal chillers.
• Universal: all three types, the credential most field technicians carry.

Each exam section has 25 questions with a 70 percent passing score, and every candidate must pass the Core section plus at least one type. Certification never expires. There is no public EPA lookup for 608 cards, so ask for the card number and the certifying organization, and confirm the type covers the equipment on your job. A state license is not a substitute for 608 certification.

What red flags should stop a hire in any state?

• No record found. The number or name returns nothing in the official lookup. Treat this as unlicensed until proven otherwise.
• Expired, suspended, or revoked status. Only an active record authorizes work. Do not accept "renewal in progress" as a substitute.
• Wrong class or specialty for the scope. A Texas Class B license on a system over 25 tons of cooling, a Washington registration without the HVAC specialty, or a California record without C-20.
• Business record without the technician, or technician without the business. In all three states, hiring requires both sides to check out, plus EPA 608 for refrigerant work.
• Name mismatch. The entity on the contract is not the entity on the license or the insurance certificate. Pay only the licensed business.
• Lapsed bond or insurance. California: $25,000 contractor bond on file. Texas: coverage meeting the Class A or Class B minimums. Washington: $15,000 specialty bond and liability insurance current in the L&I record.
• Out-of-state credential only. HVAC credentials do not transfer automatically. A Texas ACR contractor still needs California licensing to work in California, and vice versa.

Frequently asked questions

Is it free to verify an HVAC license?

Yes, in all three states. The CSLB, TDLR, and L&I lookups are free and public, and none requires an account. EPA 608 cards are verified by asking the technician for the card, since there is no public EPA lookup.

Does EPA 608 certification replace a state license?

No. Section 608 certifies a technician to handle refrigerant. It does not authorize a business to contract for HVAC work, and a state license does not authorize refrigerant handling. A compliant hire needs both.

Can one person hold the license and another do the work?

Yes, and that is normal, as long as both credentials are valid. The business holds the contracting license, a qualifying individual anchors it, and the worker on site holds the certification for the scope performed, including EPA 608 for refrigerant work.

How often should a business recheck an HVAC license?

At onboarding, at every renewal anniversary, and before the next payment on a long project. Texas ACR licenses renew annually, Washington registrations and California licenses every two years, so a credential active at onboarding can lapse mid-project. Our contractor onboarding verification checklist pairs the license check with identity, insurance, bond, W-9, and sanctions, and our electrician license verification guide and plumber license verification guide complete the trade trio for the same three states.

How do I automate HVAC license checks at scale?

Manual lookups work for one hire. They break at volume, and records change between onboarding and the next project phase. StateLicense reads the same official state records in bulk, on a schedule, so an expiration, suspension, or lapsed bond surfaces before the next payment goes out.

Quick checklist before you hire an HVAC contractor

1. Get the business license or registration number, the technician credential, and the EPA 608 card type.
2. Search the official state lookup: CSLB in California, TDLR in Texas, L&I in Washington.
3. Confirm the business record is active, covers HVAC work at the right class or specialty, and names the entity on your contract.
4. Confirm the technician credential is active and matches the scope, including the electrical credential where wiring is involved.
5. Confirm EPA 608 certification covers the equipment type on the job.
6. Confirm bond and insurance are current and under the same business name.
7. Recheck at renewal dates and before the next payment on longer projects.

An HVAC license check is a three-record habit: business plus technician plus EPA 608, on the day you hire.