This time of year, when drivers come in complaining about the heat, especially when they’re sleeping, you now can offer them a quick and easy solution, which doesn’t involve an expensive stand alone air con system or an evaporative system which doesn’t work in high humidity.
The beauty of this system is its simplicity and you can get all of the components for around $100. Cooling isn’t a problem on the road, just buy a cheap bag of ice at the servo and, bingo, solution found!
If this design strikes you as being a bit primitive, this next solution is the next step up. It uses a condenser cannibalised from an old fridge to make the air cooler more efficient and longer lasting. You just need to dig out the jigsaw and buy a 12 volt fan for a comfortable night’s sleep in the bunk.
http://youtu.be/2hmvD4LGMKc