Whole House Fan Without Attic . Whole house fans have many benefits besides just cooling the home and helping reduce electricity costs. Choose our innovative whole house fan and cool your space in minutes, without chemicals of any kind. Cheap Homemade Whole House Fan How To Cool Without A/C !! YouTube from www.youtube.com A whole house fan is most effective when outside air temperatures are below 82ºf. Whole house fans have many benefits besides just cooling the home and helping reduce electricity costs. Temperatures in the attic can.