I forget if I ever posted back last year about my coolers.
I used 32 gallon sterilite tubs purchased from a big box store. They didn't have vertical sides, which wasn't ideal for some of the designs in this thread, but I built a PVC U that was inside the tub and several inches away from the edges, and they worked super well. The sterilite is nice because you can cut it with an exacto knife, drill it, etc.
I used the recommended endless breeze fan.
For a pump, I used this guy, which is still available.http://www.lightobject.com/36Lmin-Mini- ... -P573.aspx
Before the playa, I characterized it in my lab and it was very efficient for an 18" water rise and pumped plenty of water to keep our hexayurts nice and comfy
It basically drew the advertised 320 mA and pumped water quite well.
None of our 3 pumps burned out, but since they're so cheap I'd brought along a spare just in case.
I used standard $0.79 light switches from the hardware store to control these. The fan was mounted on one side of the tub, on the inside, with the light switch right next to it. Cut a hole large enough for fan and switch to be accessible from inside the yurt, and taped around the hole with yurt tape to seal it off. When we woke up and started to feel warm, we simply flipped the light switch and delicious cold air started blowing. Back to sleep for 6 hours
Here was my previous post:viewtopic.php?f=280&t=33842&p=861194#p861194