I was at Home Depot buying some plywood and noticed they had several of their fans on clearance for around 75% off. These deals are all in-store only and YMMV - these prices were seen in the Seattle area. Home Depot product links are given only as reference.
Master Flow 6000 CFM 30 in. Belt Drive Deluxe Whole House Fan with Shutter
$80.03
Brickseek [brickseek.com]
Home Depot product page [homedepot.com]
Master Flow 1250 CFM Weathered Wood Wi-Fi Power Roof Mount Attic Fan
$43.03
Brickseek [brickseek.com]
Home Depot product page [homedepot.com]
Master Flow 1250 CFM Weathered Wood Power Roof Mount Attic Fan
$25.03
Brickseek [brickseek.com]
Home Depot product page [homedepot.com]
Master Flow 1450 CFM Wi-Fi Power Gable Mount Attic Fan
$35.03
Brickseek [brickseek.com]
Home Depot product page [homedepot.com]
ETA: two more clearance models, thanks farmingafuture and gutterman
Master Flow 500 CFM Solar Powered Roof Mount Attic Fan
~$65
Brickseek [brickseek.com]
Home Depot product page [homedepot.com]
Master Flow 4500 CFM 24 in. Direct Drive Whole House Fan with Shutter
~$62
Brickseek [brickseek.com]
Home Depot product page [homedepot.com]
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If your attic isn't air sealed then yes it's a terrible idea. It'll pull air from your soffit vents but also conditioned/heated air in your house if there is air leaks. Otherwise they should work great assuming you have enough intake via soffit vents or whatever way your intake works, and you don't have any other exhaust types such as a ridge vent.
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Unless you had two, where one was pulling in air, and one pushing out air like a computer cooling system might do...
Thank you for the response. I assume making sure everything is completely sealed is quite the undertaking.
Unless you had two, where one was pulling in air, and one pushing out air like a computer cooling system might do...
We have a slightly jerry-rigged one in our attic - 1200 CFM which is a little too small BUT it does work a bit - we only turn it on when we open the windows from outside. It helps quite a bit.
Now if only for the winter, I could seal up all those vents, and then blow the warm air back into the house. But house developers and basic AC systems aren't made to do rudimentary things outside their purview.