Duties include: Service, maintain, inspect, repair, install and replace electrical, plumbing, and mechanical systems associated with commercial and domestic air conditioning, heating, ventilation, humidification, and refrigeration equipment; including air-handling equipment, heat pumps, furnaces, heat exchangers, coils, water chillers, condensation tanks, air dampers, radiators, ducting cooling towers, pumps, etc., including auxiliary components. Maintain, repair, and install electrical circuits such as lighting, power, etc., to distribution panels, generators, motors, electrical boxes, panels, switches, outlets and fixtures, hot water heaters, electrical heating units, and laboratory equipment.