[Quixote]

Originally Posted by Blackie

Environment and Energy News » Best Available Research on Attic Fans and Power Ventilators

Here is a link to one of many articles available on attic fans. Basically there may be more disadvantages than advantages.

It should be noted that this article addresses powered attic ventilator (PAVs) which, of course, use electricity. However, as suggested earlier in this thread, a solar attic fan (and I too recommend the Solar Guys on Hwy 441) uses no electricity; it is just that: solar powered. I can stand on the attic stairs and feel the gentle pull of air up through that fan on a sunny day. I can't say scientifically, but it sure seems to me that this helps keep the attic cooler and hence lower a/c costs. It won't, however, do anything to keep the garage cooler.