Simply automating a whole house fan alone is not the answer. One always opens a window when running a whf. If you don't do that it won't work and it could cause havoc with things like an indoor gas water heater that starts backdrafting. I've thought about doing that myself. You would need a motor operated insulated damper to supplement the whf to automate the whole system. And perhaps an economizer too as was just suggested. Not cheap or easy but definitely doable.
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