I have a garage exhaust fan that cools the garage, and sends the air into the attic, which forces the hot air out. DISCLAIMER: I do not have specific measurements to show and changes in power usage as we installed the fan the first summer we were here. The attic thermometer drops by 20 degrees or more when the fan turns on.
This is a 120 vac powered fan, 1100 cfm and is controlled by a thermostat, so it will turn on late morning, and run until after sunset. NOTE: I have lots of ventilation openings in the garage doors to allow for this amount of air flow.
I agree with doing some research, as many of the points are valid.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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