In my last garage, I just kept the doors shut and the A/C on. 1500 W of bright white fluorescent lighting took care of being able to see what I was doing.
Never did like the notion of the riffraff driving by and seeing what I had in my garage.
Nonetheless, if you persist in wanting to keep the door open, make sure that part of your problem isn’t a lack of insulation in the ceiling above the garage. The house I am currently renting never sees direct sunlight in the garage but also has no insulation above the ceiling, so it gets hotter than snot in the summer.
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