Heat pumps operate by drawing the available heat from the ambient air or the constant temperature of the earth (geothermy). The inverter technology of heat pumps is highly efficient for all kinds of indoor heating.
The efficiency of heat pumps reaches 300 %. This means that for every unit of energy used by a heat pump during operation, three or more heat units are produced, which can later on be used in the building. Moreover, with the use of geothermal pumps, even five units can be reached.