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I've got central AC and the one thing a whole house fan (presumably something much more than an attic fan) can't do is lower the humidity! Also mid/late day the only thing a whole house fan does is suck in hot air. An A/C is also good to help those with pollen allergies: keep the house closed up. A whole house fan sucks in all the pollen, something to think about.
Do you have ceiling fans? Especially in the bedroom, they work great to help the illusion of cool.
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