I have been looking into getting a whole house fan. My house is two stories and just under 1000 sq ft. I was looking at this unit, QuietCool QC CL-2250 Original Classic Fan Model https://www.amazon.com/QuietCool-QC-CL-3100-Original-Classic/dp/B0091FSJT4/ref=sr_1_4?ie=UTF8&qid=1531951388&sr=8-4&keywords=Whole%2BHouse%2BFan&th=1
But here is the thing. My attic has no soffit vents. It has a ridge vent that spans the length of the roof (the interior of the house measures 25.5’, so without going into the attic to measure it I would say the vent spans 25’. 24’ if you want to be conservative), and a 12"x 12" gable vent on each side. I read online that a ridge vent offers 18 sq. in. of ventilation. So that means that at 25’ the ridge vent gives 3.125 sq. ft. and 3 sq. ft. at the 24’ measurement.
The unit requires 3 sq. ft. of ventilation. So it looks like it would be enough.
It looks to me like it works out, but I just want other opinions before I buy it.
And I was reading about the importance of soffit vents, and am looking into installing them, but looking at the construction of the house, I am not sure that is actually possible. The house has almost no eaves. I will need to crawl up into the attic to check that out.
Any thoughts or other options would be greatly appreciated.