[fghgfdfg]

I think you're thinking a little too big. All I think that is really being suggested is an automatic window cracker/closer.

If the goal is just to maintain a temperature I don't think you need to go to most of the lengths you mentioned. You have a window that is currently adequately insulated when shut. This is intended for maintenance so no need for a fan to speed things up. However the room is getting too hot now will suffice to heat it back up if needed, but again being slow means it shouldn't overshoot badly either.

It still may not be worth your time, but if just cracking a window would be sufficient cooling for most of the year it could be.

[CalRobert]

A moment's thought leads me to think you could use something like this: (temp-controlled plug bar, basically) http://www.homebrewtalk.com/showthread.php?t=536763 Attached to a motor /servo (depending on your window) that will turn on or off at a given temperature. Have a switch on the window which cuts off/enables the power when the window is open or closed at the desired max/min.