Have any of you looked at the ice-based AC? There is a company that uses a fan to blow air into an ice chest across ice, and it is supposed to be able to keep a small area cool for hours before the ice melts.
Says it will cool the cab of a small pickup quite nicely:
When the unit was started, the air in the cab was 95 degrees, parked in the shade after a morning of sun,and the outside heat index was 108 degrees. Within five minutes the cab had cooled to 75 degrees, and the air output was 65 degrees. With two quarts of water that had been refrigerated and 8 pounds of ice cubes, the ice had melted after 40 minutes, leaving 50 degree water, with an output of 65 degree air.
Switch the AC over to vent mode. It will blow air in without using any power other than a little electricity for the fan. It's much better than the AC. What I'm going to do once summer hits though is to be decided. I'm thinking about seeing what I can do about finding a vortex area near the front of the car where I might be able to build an aerodynamic vent to funnel more air in.
With my black car sitting in the sun for 9 hours, that doesn't work. It pumps out super hot air. I sometimes hit the AC for a bit, then turn it off once the inside gets below 100 degrees!
I usually open the driver's window full and the back left window just a half. I believe that doing this will decrease air turbulence inside the car because the air that gets inside through the front window will go out imediatetly through the back left window and keeping a soft air motion, specially for the driver.
If it gets really hot I open the passenger window just a bit.