A-Cool Air Cooled Heat Pump Unit is designed and manufactured according to national standard GB/T 18430.1 and GB/T 21362 on basis of fully absorbed the latest technology of refrigerant air conditioner field, it includes many scientific achievement of Kingair air conditioner: High efficiency screw compressor dedicated in heat pump condition, Strengthen heat transfer technology, Economizer cycling technology, Heat pump capacity updater, self-adaption defrost control logic etc.