Completes reactive and preventive maintenance work orders through a computerized maintenance work order system to adjust and install HVAC components such as filters, belts, starters, circuit boards, valves, motors, fans, relays, fuses, compressors, condensers, variable frequency drives, transformers, pressure regulators, thermostats, sensors, and water pumps. Repairs components and performs complex modifications of mechanical, electrical and electronic systems and components; including compressors, cooling towers, motors, pumps, fans, piping, transducers, flow switches, low pressure chillers, economizers, variable speed drivers, etc.