 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 for heat, you get a dollar's worth of heat.