The other things you can do to use that unit most effectively is to purchase the pillows that fit onto the vent fan holes and I built a reflective cover out of cardboard, shelf liner paper and aluminum foil that fits inside the skylight of the bathroom. On a sunny day, a tremendous amount of heat came in from those two places. The last mod was a curtain that my wife made that stretches on a rod behind the seats. Coupled with reflective window inserts it kept a lot of heat from the front window. I also use that curtain when driving to create a smaller space for the dash A/C to cool. The curtain coupled with two 120v plastic fans mounted on the curtain tracks above the side windows plugged into a small inverter mounted under the dash between the seats, makes a big difference going down the road on a hot day.
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