As I re-read all the posts, I guess it is necessary for you to clarify your intent.
If your intent is to keep your garage in the 70's to spend significant time in there, than the posters who say why bother, unless you put a minisplit are probably correct.
If your intent, like mine, is to keep your garage from being 10-15 degrees hotter than outside, then the door vents, and vents into the garage do make sense in my opinion. I have a refrigerator in my garage, and I was expending a great deal of energy and wear and tear on it trying to keep up with 100 degree temps in the garage, when it is only 80-90 outside. Now, my garage is at least as cool as the outside. The garage door vents are at the bottom to bring the coolest air from outside into the bottom of your garage and then create a draft going up into the attic. If you only intend to put the vents in the garage door, that probably wouldn't do much, since it doesn't create an air flow. If you put the vents in the top of the door, it would exhaust out air in the garage that is hotter than the outside, but only if makeup air is available. You definitely do not want that makeup air to be the cooler air drawn out of your house.
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