If you can't come up with something that will work... One thing you can do is take pictures of your gpus to sell on ebay or craigslist. I do expect the markets to be flooded with people who can't handle the heat.
@gotminer - Be careful about exhausting into your attic, especially when the summer is over and you move into winter. What will happen in the winter is all of the humidity that you exhaust into the attic will freeze, accumulate ice and then when it gets warm it will all melt and you will have water spots on your ceiling and possible mold...