I'm not trying to be picky but I'd just like you to be sure of what it is you want. Do you want an attic fan or do you want a whole house fan?
I don't have any personal experience with either fan but only from what folks say that have them. But since I'm not sure which fan it is that you're interested in, I have a few links for you to peruse so you can tell us which one you want.
Different Fans talks about Whole House Fans and Attic Fans, among others. Check this link out first. Then go to Jet Fans USA and check out the 2 links (one for Attic Fans and one for Whole House Fans) to see a drawing of the 2. (This will show you the difference between the 2, functionally.) Then, as an aside, if you decide to go with a Whole House Fan, How To Winterize Your Whole House Fan will describe for you a seasonal task.
If there's anything more, post up! My best to ya and hope this helps.