If you think you are going to cool down your garage with any kind of fan, you are mistaken. If you want cool then you will need to install a mini-split A/C unit.
Any garage fan are going to draw the hot air from outside into the garage so if it's 90+ degrees out then your garage will be 90+ degrees.
The problem is if you have the sun beating on your garage door, it's going to act like a radiator and heat your garage. The garage door temperature can reach 125-150 degrees on a very hot day. Also, the attic can superheat and you will get heat gain from that as well.
So the real answer is to insulate your garage door, put insulation in your garage attic and install a solar attic fan near your garage roof.
Many will say don't get an attic fan but the truth is unless you already have very good ventillation, the attic fan, solar or electric will prevent your attic from superheating. My attic used to superheat to about 150 degrees on very hot days. Not it doesn't go above 115 degrees and I've had the solar fans for the past two years.
The solar guys can do all this work.
I've done all this and I can tell you 100% my garage is about 5 degrees cooler than the outside air with the doors closes. With the doors open it will be a couple degrees cooler or the same temperature as the outside air but I don't get that heat gain from the attic any more.
Do not make these upgrades as investments. You will never recoup the cost unless you live in your home for a long time. You make these improvements for your comfort. Also, you get a 30% tax CREDIT for the cost of the insulation.
Hope this helps.
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