Attic fans and whole house fans are 2 differant things.
Attic fans pull hot air out of the attic ONLY. If the attic is cooler the house stays cooler and trust me it really helps. From last summer to this summer we have a big differance in comfort of our house. Installed the attic fan this spring.
Whole house fans pull air through the house from an open window or door and out through the attic. I would like to get one some time because I have a hard time geting the
really cool evening air into the house to cool it overnight. I think I may be however able to open my attic access and have the attic fan kinda work as a whole house fan. Hmmm I may try that tonight

:LOL