If you want the best whole house fan you can find, it is here.
How do I know? I am the expert – and here is proof – note the bottom line – these are the top 4 suppliers of whole house fans and the best has a cost per CFM that is just 25 cents!
AND if you have NO ATTIC, Invisco has a rooftop mounted option for you. And a thermostat option! Go to http://www.invisco.com for all the details.