4runner

We use a 5500-BTU window unit we got at wal-mart for under $100. We cut a square opening in the tent(dome tent) just big enough to fit the window unit in, and my wife sewed elastic around the edges of the opening so it will snug down around the A/C.

We put cheap blankets over the mesh part of the top of the tent and closed the window flaps, and the tent was comfortable during the day and almost cold at night.