Install, test, maintain and repair as necessary and directed - all cooling and heating equipment on site, which may include HVAC equipment, dual fuel boilers, high pressure centrifugal chillers, pumps, power burner domestic hot water heaters, variable frequency drives, cooling towers, generator, and all associated motors, controls, and wiring. Install, test, maintain and repair - facility air handling systems, including variable volume air handlers, variable volume control boxes, multi-zone air handlers, fan coil units, exhaust systems and all associated duct work, distribution devices, motors, controls, and wiring.