Ok lets say that I have a big garage with 7 windows, big garage door and a normal door. If i where to make a tunnel from one window to another but use insulation styrofoam as the walls of the tunnel do you think the walls would make it hotter than it should be? Maybe I should go with plywood?
have as much of an exhaust fan as you can get (in my opinion, there is not overkill here) and put that on the highest window of the garage leading out. now you just need to know where you are going to be getting your "cooler" air from and build walls on each side for the tunnel. as long as you exhaust your hot air faster, you are set.