centric air qa-deluxe 5500(r2t) energy efficient whole house fan - r-5 insulated damper - 2-speed remote with timer & temp control - 2-story homes up to 3400 sqft & 1-story up to 2400 centric air tired of sky-high electric bills? - install a qa-deluxe whole house fan and cut your air conditioning bill by 50-90%. if you live in an area with hot days and cool nights, stop throwing money away on air conditioning and save by drawing in the cool fresh night air in to your home. qa-deluxe whole house fans are proudly made in the usa.