Driving a long distance in hot weather without AC?!

I stopped in my buddys auto repair shop last week, and he had a normal box fan, with copper tubing coiled around the front of if being held on with zip ties.
On one end of the tubing he had it hooked to a aquarium pump running in to a cooler of water with frozen 1 gallon ice jugs floating in it.
The other was end of the copper was the return line back to the cooler.
I wish I took a picture of it but you could do the same with a 12 fan and pump.