 and there's heat to capture but not at 60 hertz not at a constant speed now i think a lot of people also think well with this technology perhaps a heat pump isn't really that great for the environment but that's not true no it's far from true heat pumps are efficient they have a what's a measurement that's called coefficient of performance which is the doe's measurement criteria for how efficient they are a gas furnace for example has has an efficiency of cop of one you pay a dollar