So, folks seem to like my solution, so I thought it was worthy of a post.
Meet the redneck illegitimate child of fermentation chiller:
(HBT logo not a requirement )
* 32 gallon can $12
* Box fan $12
* Old T-shirt free
* Re-usable ice blocks (soda bottles filled with water to 1" from the cap) free.
With the fan on low, and ambient temp 72-74 it stays 66-67 in there, a solid 6-7 degree drop from evaporative cooling. Adding two 24oz soda bottles twice a day drops the temp down to 62-63.
I figure if I wanted to get REALLY fancy I could nest this can in a 55 gallon can and stuff the gap with blankets for insulation, then I could do lagers in it if I used enough ice. But I digress, since the whole point is really cheap, easy temperature control for ales. No more excuses for fusels and fruity stouts...
The liquid pool is old Star-san, I threw the contents of my homer bucket in there when I mixed up a fresh batch of Star-san so the blowoff tube could go right into the "moat". No worries about slime.
Was setting here looking at your ferm cooler. Nice....
If you wanted to let things get just a bit cooler without adding more ice etc you could increase evaporation by punching some 1 inch holes just above your water line, then place the fan blowing up and out of the can. You will get a jet of air rushing in over the water and crashing into the ferm. Evaporation will go up, temps will go down.
If you make this upgrade I request you find a turbo, or supercharged sticker and put on your setup.