Air conditioning in a tractor trailer?

Well...yeah, we've got it. They can set it up in two ways, depending on how your truck is configured. If you've got an auxiliary power unit, you've got two AC compressors: one on the APU, for use when the truck's engine is off; and one on the engine itself. If you don't have an APU, you just have the compressor on the engine. You'll also have two coils in your truck. One's up in the dashboard, like it would be on a car. The other's in the sleeper.