The basics. The really, really, basic basics.

What is air conditioning? It's conditioning the air, dude. Pretty straightforward. Actually, sarcasm aside, air conditioning refers to modifying both temperature AND humidity, but not necessarily cooler. Heating air is actually a form of air conditioning. We've just come apply the term air conditioning to mean that you're making warm air cool. But that's not necessarily accurate. Now you know. Tell your mom!