Although I don't have AC on my PUP, it is "prewired" from the factory for it. What this means is that there is a dedicated 20A receptacle for the AC (i.e. it's the only device on that circuit). Mine is located low on the wall below the dining table; yours may be different. The AC cord would route across the ceiling, down a wall and plug into that receptacle. The cord would need to be about 10' long to reach.
FYI - You can tell a 20A receptacle because one of the slots is a "T" whereas the 15A receptacles have only straight slots.