Radiana, I live on Long Island's south shore and it gets very humid here during the summer months. My attic has gables at both ends and on the south end, we installed a large temperature-controlled attic exhaust fan. It's set to go on when it reaches 85 degrees up there. My house is average size (1500 sq.ft.) and I use window a/c units. When I don't need the a/c's, I pull down the attic stairs a bit and let the attic exhaust fan pull air through the whole house - surprisingly, it creates a nice breeze! I'm not familiar with solar fans, but our way was very low cost!! Hope this helps...