Many opinions, and none are really wrong. I have a west facing garage and it gets very warm.
My experiences:
Insulated door, helped some.
Added vents to garage door, installed a ceiling exhaust fan, and a solar attic/roof fan, helped more but was still hot and fan noise was too excessive. Could hear the roar in the house. So, I closed the vents and fan off with insulation.
Final solution, while we were enclosing and finishing off our lanai, a Mitsubishi in-ceiling split was installed. Works great. So, I had a Mitz wall mount split added to the garage. It shares an single compressor outside that is rated for both. I leave it on low, set at 78-80 degrees. Keeps garage very comfortable for the very spoiled Corvette sitting there all summer.
But again, any of the other solutions cited here can improve temp.
Just my approach(s) to the problem. May be overkill and not for some.
Warning: Once it was approved by the boss, and installed, she informed me "Now I can spend matching funds on something for ME in the house." So, don't under-estimate the cost of your solution!!
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