Respond to emergencies by going onsite and troubleshooting a variety of problems; and disassembling, repairing, adjusting, or replacing condensers, thermostats, diffusers, humidistats, pumps, compressors, belts, pulleys, and related equipment. About the position: This is skilled work in the installation, operation, maintenance, and repair of refrigeration and/or heating, ventilation, and air-conditioning (HVAC) systems, units, equipment, and peripheral devices in state-owned and operated buildings.