IMHO, you can get an AC powered fan installed for less than 1/2 of the cost of a solar unit, and it will move 10 times or more hot air out of the attic. If you get a thermostat on the unit, then it will only run when needed, and it will continue to run after sundown to cool the attic if necessary.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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