QA-Deluxe 6500 Energy Efficient Whole House Fan – Low Voltage Plug & Play, 2-Speed Wall Switch & Timer, Removable Grille – 10-Year Warranty – Up to 4400 sq ft (2-Story) & 3000 sq ft (1-Story)

Easy to install and simply engineered. Does a great job of quickly, and fairly quietly, turning over the air in the house to cool it off.

Very good company to work with. Had trouble with fedx in delivery and mike worked with me until we received all packages. The fan works great. We hav a 3400 sq ft house with 2 levels and I installed fan in downstairs hall. Pulls air in on both levels on low speed. It takes some work to install the fan and ductwork. Definitely a full days work. I bought the unit that has speed switch and timer so I had wiring to do in the wall and upstairs in attic. I would recommend this unit to anyone looking for a whole house fan.

I find these to be ridiculously overpriced. The only truely unique part is the insulated damper grill assembly. I was replacing the original whole house fan that was noisey as a train and basically was a 2x2 hole into the attic. Besides the massive heat loss that caused ice dams in the winter, I found moisture issues. Installing this was part of correcting the problems caused by the original system. New fan is quieter. I dont recommend dumping conditioned air into an attic space. Matter of fact, its against cide to dump bathroom vents directly inyo the attic, must be directly vented outside purposely. I vented directly out the side of the gable end, installing a louver.

My house is over 4,000 square feet. I live in Colorado where the temperatures are in the 90s during the day and in the high 60s at night. I run the fan for eight hours, 11 p.m. to 7 a.m. Yesterday when it was 98 the house was 70 degrees at 8 a.m. and was 84 at 7 p.m. with no air conditioning. I can live with the 84 degrees for a couple of hours or if I am active and don't want to sit on the deck, I turn the air conditioners on. Overall, my electric bill has been at about $150 a month instead my $350 before the whole house fan was installed. The remote control should be a timer and not a selection for either 1,2 4 or 8 hours. I have a decibel measure on my iWatch and with the fan in the garage attic and the duct located in the adjacent mud room the sound of the fan is at 58 decibels which is the same as the fan in the bathroom. The installation was about another $500 so altogether I have $1,700 invested but if it saves $200 to $350 a month the repayment will be amazingly quick. Do not confuse this fan with the older and probably cheaper ones that sound like helicopters.

I got the 3000 sqF for my 2600 home. It’s 85 in my house and 73 outside. After an hour it’s gone down to 83.It works it’s just not magic. I still run my AC for a little to get things cooler quicker. If I didn’t install myself it wouldn’t be worth the money to me. In combination with ac I think it does well. Maybe in the long run it’ll be worth it. Oh and it’s not quiet by any means. Low is useless. And high is much louder than AC.

Super easy to install and super quiet, It pulls in the fresh air all day and night. I have a 4200 sq ft home and have no issues. I wish I would have installed it sooner. The added insulated flaps help keep the warm air and cold out of the home.

We had an existing 30" whole house fan mounted on the ceiling in our hallway. It moved a lot of air on high, but it sounded like an airplane in the hallway on the high setting. On low it moved a lot less air but was quite a bit quieter, although we still had to turn up the volume of our TV while watching it about 30' away and offset from the hallway that it was in.This new QA6500 is quieter on high that the old one was on low. We can hear it throughout the house but it's a fairly quiet hum, maybe a little louder than our microwave oven. It doesn't move as much air as the old fan, but we can use it on high even going to sleep.Installation took me two days at a slow pace, made more difficult since our house uses trusses and the existing whole house fan was located next to our furnace so access required contortionist-like movements and standing/bending in awkward positions to work. Because we have blown-in insulation I also used some rope to keep the fan housing tilted up slightly, and put a section of cardboard below the output to make sure that the insulation wasn't disturbed when the fan was turned on. Using just the eye-hook above would have resulted in the fan pivoting down with the air thrust when turned on.Happy with the fan as installed.

I've purchased and had a professionally installed whole house fan in every home I've ever purchased (6 total). We finally got to build our dream house and I went with the top-of-the-line recommended QA 6500.It's a piece of junk! The first night we stayed in the house we thought it was haunted because it sounded like the foundation was shaking from all the banging coming from the QA 6500 louvers. I wish I could upload a recording of how loud the banging is. 5200 Sq/ft, 2 story, home and you can hear it in every room. Babys are freaking out, dogs won't come in...insane.Customer service said the fan was in the slipstream, blamed it on the installer (professional HVAC guy that told me to go with Quiet Cool but I didn't to save a few bucks). He came back 3 times and turned the fan every way possible.Today we both got up in the attic and he physically prevented the fan from turning...louvers still banging and rattling the house.I've disconnected the fan, put a board over the louvers and now I'm trying to figure out how to get my money back. I'll buy another fan, I'll pay another fortune to have it installed but sure and heck won't be this brand.