Heating, Air Conditioning, and Refrigeration Technology Occupational Skills Award (OSA) Certification Exam

Heating, Air Conditioning, and Refrigeration Technology Occupational Skills Award (OSA) Applicants should review HVAC system components—compressors, evaporators, condensers—and refrigerant properties before attempting this assessment. Familiarity with electrical circuits, pressure diagnostics, and safety protocols like EPA certification requirements strengthens performance. The OSA evaluates troubleshooting across residential and commercial units, so foundational knowledge of thermodynamic cycles and leak detection techniques proves essential preparation.