I just had a whole house fan installed in my house a few months ago and it's hands down the most effective energy efficient appliance i have in my house! I was paying over 500$ a month on pg&e and after I installed this fan I barely use my A/C anymore which cut my energy bill a month down to about 200$ a month! The fan I have is the quietest, most durable and effective fan on the market backed with a ten year warranty! I'm so blessed to have this in my home now! Please ask questions or leave comments good or bad about your own fan or thoughts about getting one.