Hi all, I am wondering about heat pumps, not necessarily ground source heat pump. What percentage of heat is taken from the ground? My understanding was that 100% of the heat is taken from the ground but it costs 25% (if COP of 4) in electrical energy (running the compressor) to convert the heat from low temperature heat into high temperature heat (albeit a smaller amount). From reading some forums, some people think that if I have a 4kW heat pump and achieve a COP of 4, that the ground collector only needs to absorb 3kW of heat energy and the other 1 kW is supplied from the electricity, i.e. the compressor. Is this correct?