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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Compressing a gas takes energy which is transferred to the gas from the pump. This is the simplest stage. The gas heats up and is used to heat whatever you want.
The second stage is more complex. Say you add 1000J of energy. Then 600J is transferred to the air you want to heat. But the loss in energy condenses the gas to liquid. Now you have to release the pressure to create a gas again. This loss of pressure reduces the energy, let’s say by 700J. Now the gas is colder than it started. As long as the ambient air is warmer than the gas it can start absorbing heat. In this example it can potentially absorb up to 300J virtually for free. Then the cycle continues.
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