Do a search on garage or attic fans, we installed a garage fan (1100cfm) exhausting to the attic. This pulls cooler air in the garage, and forces all of the hot air out the attic vents. Works very well, and costs much less then 1 solar fan, and moves over 10 times the air (cfm), also works at night until the temperature drops.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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