Perform preventative maintenance tasks on the following systems: air conditioners, heat pumps, gas furnaces, pumps, steam, and hot water boilers, cooling towers, air wash systems, evaporative coolers, air compressors, exhaust fans, blowers, VAV and VFDs, computer room A/C, air dryers; to include: water treatment, air-water filters, balancing, alignment, inspection and measurement and cleaning of above systems. Troubleshoot, repair, install, and replace: air dryers, computer room A/C, makeup air units, split package A/C & HP, VAV, VFD, pumps, chillers, air handlers, cooling towers, air wash systems, evaporative coolers, steam and hot water boilers, air compressors, exhaust fans, and gas furnaces.