This is the whole house fan that I installed:
Quiet Cool Fan
We love it and it's not as loud or unattractive as the typical whole house fan. Our home is 3,500 sq ft and we have four fans installed. You can turn on each fan individually or all at once. This allows you to control the direction and flow based on the temp. And also It works great and has saved tons on the electric bill. Plus, we also received a rebate from our electric company.