I've done the foundation vents, but the RV vent on the roof would be perfect in the summer. Give the heat a way to get out through the top. If you wanted to get really fancy, you could buy one with a fan if you had access to powermissed this one this could work well .you might want to look at foundation vents I have one in the north wall of my first coop It has a thermostatic spring that opens and closes it at around 35 or 40 degrees but it's costly $30.00 at home depot of course I got it free from work