... heater heat pump heating: 4.5kW, 8kW, 13.5kW cooling: 3.5kW, 7.2kW, 12kW CE,CCC,ISO9001,ISO14001 Air source ... compressor.Generally, heat pump can achieve a COP(heating) of 3 and the corresponding COP(cooling) would be around 2, Hence ... the central A/C plant which is a cool medium. 3.5kW air conditioner water heater heat pump