... 2.Adopts world famous parts 3.On line system 4.R410a Air Source heat pumpModel: AW09,AW09B,AW10,AW10B,AW12,AW12B,AW13 ... , ISO9001;3.On line system reduce your service cost sharply ;4.World famous parts , quality is assured;DAIKEN OR HITACHI scroll ... , All your inquiry will be replied in 24 hours . Air source heat pump