I have the vents and no fan. I have check the tempeture between outside, garage and attic. The differences ranges up to about 10 degrees. Now the garage is cooler than outdoors in the morning and the attic is a lot hotter in the evening so a fan running in the evening might be of some help but overall I don't think a fan is needed, epically during the afternoons. Turn off you fan and measure the temps and see what happens with your house.
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