My neighbor
had the solar guys put a solar vent fan on the roof. Very expensive with little if any noticable difference.
The problem is all around the perimeter of the house is perforated sofit. The air that the exhaust fan removes comes in from those sofit openings. It may cool the attic a little but will not help much for the garage.
I happen to have a man door at the opposite end of the garage doors. If I open this door and rasie the garrage door 4" it's like a wind tunnel in there. It really cools hte garage regardless of the attic temp.
Now I need to work on a permanent lover in the man door. Our garage doors can be fitted with a bottom panel that has stamped in vents all along the bottom. The panels are also fitted with screens and I will have to add screens to my man door louver as well to keep the critters out.
Sorry I have temporarily run out of cash so I haven't made this modification and don't have any proof that this will work. I do know that if you pull air out of a space you must allow fresh air in from somewhere. I am fairly certain that I will get flow thru ventilation from a change like the above.
I can say for certain that if I prop open the man door and rasie the garage door a few inches it stays cool. Remember the air temp it still over 90 during the day. So cool is a relative thing.
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