Knowledge of the principles of operations, methods, materials and tools utilized in the installation, troubleshooting, maintenance, calibration and repair of air-moving, heating, cooling, humidification and filtering equipment and systems such as fans, heat pumps, gas unit heaters, forced air equipment, furnaces, radiant heating, condensers, compressors, pumps, fan coil units, rooftop package air conditioning units, computer room cooling units, etc. Installs and maintains air-moving, heating, cooling, humidification and filtering equipment and systems such as fans, heat pumps, gas unit heaters, forced air equipment, furnaces, radiant heating, condensers, compressors, pumps, fan coil units, rooftop package air conditioning units, computer room cooling units, etc.