STAR Residential-Light Commercial HVACR Mastery STAR Residential-Light Commercial HVACR Mastery certificates technicians in systems serving typical homes and small businesses. The exam stresses EPA Section 608 refrigerant handling, heat pump diagnostics, and ductwork design—skills that directly pay off when troubleshooting a frozen coil or sizing equipment for a small office addition. Technicians who pass unlock jobs where these everyday repairs and installations define daily work.
| Exam Name | STAR Residential-Light Commercial HVACR Mastery |
| Format | PDF & Practice Test Engine |
| Target Year | 2026 Updated |
| Features | 100% Verified Q&As |
