They work OK if you have two. Take on apart and rewire it so it turns into an intake fan. You won't be cooler than the outside, but you won't be making an oven either.

That being said, I've only used them around here- I won't speculate on thier performance other places.
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-IronRaven

When a man dare not speak without malice for fear of giving insult, that is when truth starts to die. Truth is the truest freedom.