If you’re looking to find a way to help lower your energy bill during the summer, don’t hesitate to buy this. I had my reservations at first, and decided to buy on just to help control my hot attic temps, plus lower my energy bill. I bought one, and was so impressed with it and decided to buy 2 more to replace all (3) electric fans. I had an electrician install outlets, so that I can take advantage of the A/C functions during those cloudy, humid days. If you decide to buy this , 1 is good but you will definitely need at least 2 to notice a real difference. So far, my second floor has yet to rise above 72 degrees, and it’s a 88degrees outside. And with those higher than normal energy costs, you can’t afford to overlook this. #FJB