Is the Heat Exchanger Really a Radiator?

It basically can be any kind of system. The systems that you and I grew up with, the four stair systems, they're just pumping air through ductwork. Or it's literally just taking the hot air from the house, running it across essentially a heat exchanger,. Which transfers that heat into the liquid that's in the tubing that gets shunted down into the earth to cool off to come back up again. It's the same exact principle that is in the radiator of your car. If you have a liquid-cooled PC, it's the same basic principle across all these things.