How Do You Get an HVAC License in Washington?

Our research did not find a statewide mechanical or HVAC technician licence in Washington: the L&I licensing menus we checked list no HVAC or mechanical program, so we found no state technician licence to apply for before you start HVAC work.

That absence is our inference from those menus rather than a statement L&I publishes, so confirm it with L&I if it matters to your plans.

The narrower layer our research did find sits on the electrical and control wiring side of HVAC work: L&I's electrical specialty certificate — 06A HVAC/refrigeration or the restricted 6B.

Who must hold which certificate for which work was not confirmed in our research — that part, check with L&I.

Some cities may also license refrigeration or gas-piping mechanics locally, a lead our research flagged but did not confirm; check with the city where you work.

Refrigerant handling adds the federal EPA Section 608 certification on top of the state's requirements.

Our research found no technician ladder in Washington.

The worker credentials we did find are electrical specialty certificates — the 06A HVAC/refrigeration certificate and the restricted 6B — and they attach to the electrical and control wiring side of HVAC work; our research did not confirm a state credential covering the mechanical side.

On the business side, an HVAC company registers with L&I as a specialty contractor, a registration that requires no exam and no qualifier.

One more layer our research flagged but did not confirm: an HVAC contractor that performs its own HVAC electrical/controls wiring may also need an L&I electrical contractor licence with an administrator or master in the relevant specialty.

The 06A HVAC/refrigeration specialty takes 4,000 hours of supervised experience, supervised at least 75% of the time, plus 48 hours of basic classroom instruction.

Trainees working toward 4,000-hour specialties such as 06A must complete that classroom instruction before they can renew or qualify for the exam.

The restricted 6B takes 2,000 hours with 100% supervision until the exam.

Our research did not capture L&I's application fees for the specialty certificates — check the fee schedule on L&I's electrical pages before you apply.

The contractor registration's requirements are a Department of Revenue business registration, a $15,000 surety bond for specialty contractors ($30,000 for general contractors, both amounts since July 1, 2024), general liability insurance of $200,000 public liability plus $50,000 property damage or a $250,000 combined single limit, and a $150.20 application fee.

The registration requires no exam and no qualifier.

Our research does not name the vendor or the content of Washington's HVAC/refrigeration specialty exam.

What the sources we read do show: the restricted 6B's 2,000 hours run with 100% supervision until the exam, and trainees in 4,000-hour specialties such as 06A finish their 48 hours of basic classroom instruction before they can qualify for examination — so an exam sits on the specialty-certificate path.

Which vendor delivers it and what it covers were not captured; L&I's electrical licensing, exams and education page is the place to confirm.

The contractor registration requires no exam at all.

Renewal terms for the 06A and 6B certificates were not captured in our research, and neither were the contractor registration's — ask L&I what your renewal will need before you file.

The rule our research did capture is the trainee rule: in 4,000-hour specialties such as 06A, a trainee must be supervised at least 75% of the time and complete 48 hours of basic classroom instruction before they can renew or qualify for the exam.

The federal EPA 608 certification, a separate credential for refrigerant work, does not expire.

Our research did not find a Washington HVAC reciprocity agreement or a published rule on recognizing another state's HVAC credentials.

Part of the reason is structural: our research did not confirm a state mechanical HVAC licence, so we found no state HVAC credential for another state's licence to transfer into.

The open question is electrical: whether L&I credits out-of-state electrical experience toward the 06A or 6B specialty certificates was not captured in our research — ask L&I before you count on your out-of-state hours.

The lookup our research confirms is L&I's 'Verify a Contractor, Tradesperson, or Business' tool, which covers contractor registrations and plumber and electrician certificates.

Our research did not capture the tool's direct web address, so start from L&I's site at lni.wa.gov and search for the tool by name.

Check an employer's contractor registration before you sign on, and your own electrician certificate once it issues.

Yes, if the work is the kind the federal rule covers: 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 a class I or class II refrigerant or a non-exempt substitute refrigerant must pass an exam from an EPA-approved technician certification program.

Certification comes in Type I, Type II and Type III versions, and the Universal option covers all of the appliance types described for those three.

EPA 608 is a federal certification, not a Washington licence, and it does not expire — it applies alongside Washington's requirements, not instead of them.