I don’t get it. How is cold, even freezing air turned into heat? How is it less energy consuming than other heating systems?
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Even freezing cold air has a small amount of heat in it. If you use a lot of the air, you can remove some of its heat, accumulate it in an insulated container (like a thermos bottle), and use the stored heat to warm up something else. The freezing cold air becomes even colder as a result, but you’ve kept some of its former heat for your own use.
When the air gets REALLY cold though, it becomes too much work to try to squeeze out the little bit of heat available. Then the heat pump needs help, getting some additional heat from a gas or electric heater.
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