Oh I just had another thought.

If you really want to break new ground, try this experiment:
Use HID lights, and keep the refregerator running. You might not need any fans for the lights. When the temps get too hot, you could have the fridge turn on and cool everything down. You would have to do a little experimenting with fridge settings and times, but I think this may be possible.

Has anyone ever tried using a refrigerator to cool their grow area? Talk about the ultimate way to easily keep a grow room cool. Just have your grow in a refrigerator.