HVAC Technician License Requirements in Washington
License RequiredLast verified March 24, 2026
Agency And Exam
Issuing agency: Washington State Department of Labor and Industries
Official licensing agency website
Exam provider: PSI
Reciprocity And License Levels
License levels
HVAC/R TraineeHVAC/R Specialty Technician – 06A (HVAC)HVAC/R Specialty Technician – 06B (Refrigeration)
Reciprocity states
None listed
Notes
Washington L&I issues HVAC/R Specialty Technician certificates under the 06A (HVAC) and 06B (Refrigeration) classifications. Trainee registration required to work under supervision; Specialty Technician requires 4,000 hours of experience and passing a trade exam. PSI administers exams. Contractor license also required for business operations.