Troubleshoots, repairs, and overhauls equipment such as chillers, cooling towers, air compressors, pumps, air handlers, pneumatic valves, electric valves, heat transfer equipment, other environmental changing devices, other mechanical equipment or electrical, pneumatic and electronic components. General Summary: Oversees and performs installation, maintenance, and repairs of all residential and industrial heating, ventilation, air conditioning, and refrigeration systems and their associated equipment which includes pneumatic and Building Automation Controls (DDC).