Reduce a/c usage up to 70%. The answer to this question is that yes, whole house fans work very well at cooling homes, but only under certain conditions. Whole House Fan Discover New Ventilation Technology - Solatube Whole House Fans Whole House Fan House Fan You use it as an exhaust fan in conjunction with opening the windows of your home, to pull a breeze through your entire home. How well does a whole house fan work . They are easy to use and their proper use will reduce your energy bills considerably. It’s actually very interesting how all this works. That means you get results instantly! Simply put, a whole house fan pulls outdoor air and circulates it through your home. A whole house fan works by creating negative pressure. Second, how does a whole house fan work? A whole house fan provides natural, effective cooling for a fraction of the cost of air conditioning, making it one of the best home energy efficiency upgrades. Like in region 1 above, a whole hous...