I installed a 120 vac power attic fan from the garage to the attic. Removed the glass in the garage door windows, and added screened vents. Fan is on a thermostat, only comes on when necessary, and RUNS AFTER DARK if necessary. Total cost under $250, works great. No roof penetrations, and the fan (1100 cfm) forces hot air OUT all of the existing roof vents and soffits.
I would be glad to show you my installation if interested, send me a PM.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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