Yes, and if your running in the heat of the summer, you will need the front A/C, like described above to keep the place cool. We run a small utility air blower sitting near the kitchen area in our 31FS to force more cold air to the back of the coach as well.
Another thing that helps us when we arrive at camp is to immediately pop the hood and prop open till the chassis cools off. This allows for heat to escape faster from the engine / underside of the coach.
Making reflective insulation covers for a couple of the larger windows helps as well if the heat outside gets too bad. It surprised us how covering one large window helped keep things cooler.