>>28454200
It takes hot liquid refrigerant and shocks it back into a vapor at the interior coil inside your house via a metering device, like a little orifice or thermal expansion valve. When the refrigerant expands into a vapor, the pressure difference causes a drop in temperature through the magic of Willis Carrier's enduring spirit. Air flowing across this coil is cooled and the water in air condenses on the coil to be drained away.

This cool vapor is then sucked back to the compressor, where it keeps the compressor cool before being ruthlessly compressed back into a liquid and shot back into your interior coil overlooking your goon cave.

And to do heating it just fucking runs in reverse.