My two cents worth-for free
Cooling effect
Depends on how you feel as opposed to thermometer reading.
Reason is simple. Your body cools based on sweat-water evaporation. Moving air evaporates more sweat so you feel cooler.
Sticking a fan in your garage running on automatic
I would not do it. You/I have all kinds of flammable stuff in the garage. Car, paint, sawdust, to mention a few. A fan introduces more oxygen-remember fanning charcoal, a campfire etc. Properly installed there should be a thermal disconnect.
Simple and cheap. I have a fan that I only run when I am working on something in the garage.
Solar fan
Since as described above my use in minimal I would not see any cost savings. For me a viable system would require the collector plus a battery to store the electricity. So the cost goes up as well as the space required.
A fan and air flow
Think of sucking air out of a coke bottle. Nothing will happen,
You need to allow air to get into the bottle as well as trying to such it out. So you need to install intake vents of some kind.
A fan will be rated at free air flow. Vents are not 100% efficient
so the rated flow is reduced in the real world.
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