Heat Pump

Heat pumps work by extracting heat from outside and transferring it either to the hot water or heating systems of the process , or both. An air source heat pump consists of a compressor and an evaporator coil and heat exchanger and expansion valve. 

Air-source heat pumps can operate at a wide range of temperatures. It does not need to be a summer's day for the pump to function. The units will be able to extract heat from the air even at 25°C.