You've probably noticed it on a hot day. You start the car, turn the air conditioning all the way down, and wait. The vents are blowing cool air, but it's not exactly cold air. Then you pull out of the parking lot and start driving. A few minutes later, the cabin suddenly feels much colder.
So what's going on? It's tempting to think the air conditioner simply works better when the engine is revving higher. There's some truth to that, but it's not quite that simple.
