I just put in an attic fan in our Gardenia, and the temperature ion the attic drops 15 -20 sometimes more. I used a 1100 cfm fan which is much larger then any solar fan, and will run into the evening if necessary to cool the attic. Also cost much less then solar fan.
Just my thoughts, hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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