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.
Messy blowoff from barleywine not included.