I used this as a guide for a fermenter. I added a copper coil inside that i connected to an old mashtun watercooler with a 12v pump on a temp controller. I add ice and some water to the cooler and so far it has kept it regulated to within a degree of set temp. The cooler keeps ice for about 3...
I've done a couple Saisons and they fermented at around 73-75*. They turned out ok, some slight off flavors that I attribute to the higher temps. I don't have a fermentation chamber yet, it's in the works.