Assists with repairs of complete systems to include repairing, calibrating, or replacing controls, switches, thermostats, transformers, gauges, wiring fans, pumps, compressors, condensers, piping, and other functional components of the system. Performs preventive maintenance on equipment to prevent equipment failure by cleaning air handling systems and reheat coils, monitoring and calibrating air handling systems and replacing filters, motors, fans, belts, etc.