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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Basically moving heat energy is always done in the same way, be it a fridge, freezer, air-conditioning or heat-pump (In fact, air conditioning and heat pumps are the exact same system but running in reverse)
When a fluid converts from liquid to gas, it absorbs a ton of heat energy from its surroundings. When it turns back, it releases it. The boiling point of liquids can be manipulated with pressure.
So you move a liquid from a high pressure area, to a low pressure area and back. During this, it changes from liquid to gas to liquid. Doing this you move heat.
The other important thing to realize is that everything has some heat energy unless its absolute zero (0 degrees Kelvin), meaning that even if it is -40 outside, there is still heat there (Admittedly, not much, hence heat pumps get less efficient the colder it is outside), which can be moved inside your house. As it turns out, its a lot more efficient to move heat than its to actually generate hate directly with electricity. Up to 5 times as much. Meaning a heat pump in ideal conditions can achieve a 500% efficiency rating compared to a plain electric heater
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