It's able to do this via a temp change as part of the compression cycle. When gas expands it's container gets cold. These systems can move heat from outdoors to

It's able to do this via a temp change as part of the compression cycle. When gas expands it's container gets cold. These systems can move heat from outdoors to inside in cooler weather. Your Air Conditioner doesn't make cold, it moves your heat outside. So being able to move or collect heat is how efficiencies over '100%' can happen, it isn't free just more efficient than space heaters.