The key here is to get the heat out of the attic. Heat from the attic will transfer down into the garage. So insulating the garage ceiling helps reduce the transfer. I install a garage attic fan which works great with 3 vents installed in the doors. You can feel the air flowing through the vents. However, I have determined this season so far with the stairway ceiling door opened 12" allows the air to flow into attic which helps keep the attic temps cooler.
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