HOW DOES AN AIR SOURCE HEAT PUMP WORK?
Electricity is needed to power the pump. The efficiency, or the measure of the heat energy output per kW of electricity, is stated as the SCOP (Seasonal Coefficient of Performance). For example, a SCOP of 3.2 means that for every 1kW of electricity, 3.2kW is generated.
The air source heat pump gets its energy from the surrounding air, so as the air temperature drops, so does the efficiency. The bigger the difference between the outside air and the target temperature (either the indoor room temperature or domestic hot water), the lower the efficiency. It is therefore key to understand the heat load of the property and the performance characteristics of the heat pump.
For space heating, air source heat pumps work best with underfloor heating, but radiators will work as well.