AirSourcePrincipals...

The RM Eco Energy heat pumps use similar technology to that employed in domestic refrigerators or freezers. The ecologically friendly refrigerant, which has a boiling point of about -40oC, evaporates in the evaporator coil and this then extracts heat from the outside air which is blown over the evaporator coil by a fan. Because the gas in the evaporator coil is so cold it will absorb heat from the ambient air at temperatures down to -20oC. The refrigerant gas then passes into the condensing heat exchanger and as the heating circuit water cools the refrigerant it condenses thus passing heat energy into the water which is used to heat the property.

Typically the heat passes into the house will be 3 to 4 times the energy used by the compressor and fan, so most of the heat supplied is renewable. Therefore heat pumps are not only a cost reducing and energy saving alternative, but they also reduce your carbon footprint.