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How Do Heat Pumps Work?
Our in-house physics whiz explains how a heat pump can warm your home without burning fossil fuels.
The great thing is that they're generally more energy-efficient than old-school heaters, and they don't burn any fuel, so replacing that old gas furnace can really shrink your carbon footprint. To be honest, even physicists misuse the term sometimes as a shorthand, but properly speaking, an object can't “have heat” or “lose heat.” Think of it as a verb, not a noun. Wait a minute, you're gonna say: In the first stage, when we stretched the rubber band, it got hot, and then it cooled back to its original temperature—and in doing that it heated the air.
Or read this on Wired