Heat pumps move more heat (which has the same unit as energy, that's why you can put the numbers in a ratio and get a unitless number) than they use energy for

Heat pumps move more heat (which has the same unit as energy, that's why you can put the numbers in a ratio and get a unitless number) than they use energy for the process. This is the crucial point for heating with them, otherwise they would make little sense (except for using them for cooling) over having an electric heater instead. Here is something to read on this: https://en.wikipedia.org/wiki/Coefficient_of_performance https://en.wikipedia.org/wiki/Coefficient_of_performance Jump to "Examples" if you like concrete examples.