Originally Posted by
big john
Swamp coolers work best with low humidity. Ever see those round coolers you hang on the window of a car? It had a cylindrical straw pad and water in the bottom. You pulled a string which rotated the straw into the water. The air blast from driving forced air into the car.
Back in the 50s we used these in Tucson but only when taking longer trips as they were a pain to maintain but worked well until we got back east.. Today's evaporative auto coolers are 12v units that sit in the car/truck.