I do not have the garage door vents but I do have the sliding screens for my garage with the solar mesh screening which definitely helps reduce the garage temperatures, but I do not have an powerful attic exhaust fan to suck the hot air out through the roof. I do have a solar fan in my roof to cool the attic and when I open the attic entry panel you can feel the air being sucked up into the attic area. When I started inquiring about getting a powerful attic exhaust fan to cool my garage even more, the contractor I was talking to said "an attic exhaust fan will simply suck warmer outside air into your garage and up and out through the attic but will not cool your garage". He convinced me that unless your garage is significantly hotter than the outside air (mine isn't because of my screening), you are merely replacing the garage air with outside warm air...what's the point? Maybe garage screening with the white solar mesh is a better solution.
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