If you have a basic non-insulated garage door you can buy a roll of reflective barrier material at Lowes or Home Depot. Cuts easily with scissors and easy to install. It did a good job of blocking the radient heat coming off the inside of the garage door for me. I also prop open my ceiling access a few inches to let some heat escape. Garages can turn into ovens during the summer if you don't do something to block or move the heat out.
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