Graduation from an accredited school (two year program) in heating and air-conditioning and two years of full-time experience installing, altering, calibrating, repairing, and maintaining HVAC control systems and performing corrective and preventive maintenance on HVAC systems. Equipment includes but is not limited to industrial/commercial/domestic HVAC and refrigeration equipment, motors, audio visual equipment, scoreboards, lighting systems, pumps, compressors, boilers, card access systems, building alarm and DDC control systems.