I have an east facing garage and it got way too hot. I purchased insulation from Texas Garage and for about $275 insulated the garage doors myself. Took about two hours. Did not want to use styrofoam because of adhesives and did not want to dismantle anything to put in the insulation. I did not have the proper equipment to test the temperature before or after but it was significant, however, during the summer months, not cool enough to work in the garage comfortably. It is a good first step before making a significant expenditure to extra cooling. By the way, the insulation is lined with white plastic and it looks great aesthetically.
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