Continue advancing your NCCER credentials in this HVAC Level 2 course. Topics include hardware and wiring terminations, control circuit and motor troubleshooting, troubleshooting cooling, troubleshooting heat pumps, troubleshooting gas heating, troubleshooting oil heating, troubleshooting accessories, zoning, ductless, and variable refrigerant flow systems, commercial hydronic systems, steam systems, retail refrigeration systems, and customer relations.