 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 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 an efficiency of COP of one. You pay a dollar...