Administered by State / local licensing board (often via PSI or Prometric)
A full-length state HVAC/mechanical trade-license practice exam covering the International Mechanical Code, combustion and venting, duct and gas piping, refrigeration, electrical for HVAC, load calculations, ventilation, safety/OSHA, and business & law.
The timer starts when you begin. You can flag questions and revisit them before submitting.