Miles O’Brien:
Heat pumps are so green because they're not creating heat. They're just moving it from one place to another. Inside, there's a fluid called refrigerant that actually boils at minus 40 degrees below zero Fahrenheit.
As long as the outside air is warmer than minus 40. The refrigerant picks up heat from the outside air as it becomes a gas. It flows into an electric compressor, where it is put under pressure, adding more warmth to the gas. The warm gas flows into your room unit.
As it heats your room, the gas itself condenses back into a liquid. Now the liquid travels back out, flowing through a valve that lowers the pressure and thus the temperature. And the cycle starts all over again. So, in the winter, you can pump heat inside and, in the summer, reverse the process to pump heat outside, cooling your room.
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