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I had a couple of those mushroom looking electric fans on the roof back in the day. When the attic got to a certain temp they would automatically come on. About 15 years ago a hurricane blew them both off my house (along with the chimney and a big portion of the shingles) and when they re-roofed the house they added about fifty feet of low-rise ridge vent and plywooded over the areas where the fans were.
The attic doesn't seem any hotter now than it used to be with the electric fans so the ridge vents seem to be working well.
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