Just did the insulation on the interior of the doors with a product purchased on line. No adhesive and did it myself in about 2 hours. Did lower the temperature enough to make it much more comfortable. Opening the window does pretty much nothing. Many of the other solutions, like poking holes in the door, attic fan, etc do seem worth it to me. If you use the garage as a work area, pony up the money and get a split for the most comfort.
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