Ok, so my brain started thinking today about some ideas for controlling fermentation temps. Here is what I'm thinking of. Please tell me if this would work or not.
I want to get two of the 15 gallon ace rotomolded conicals. Each would have a stainless coil in it attached to the screw on lid and would hang down into the fermenting beer. These coils would have insulated tubing that would be hooked up to an aquarium pump sitting in a 5 gallon bucket of glycol that is sitting on the hump of a 7 cubic foot chest freezer. This would be located in my basement and I'd want it to ferment down to lager temps sometimes but mainly ale temps. I live in nj, so basement temps range from 60 in the winter to 75 or so in the summer. I could insulate the conicals with reflextix or something. The pond pumps would be hooked up to an eBay temp controller (one pump per controller)
My biggest concern, and the deciding factor on this would be my ability to continue to use the rest of the freezer for its actual purpose. I don't want to take up the whole freezer with a glycol reservoir, and I don't want to put another freezer in my basement. So I just want to have a bucket of glycol in there. My concerns are that 4-5 gallons of glycol would not be enough volume to regulate 2 10 gallon batches of beer, especially if I was trying to lager something.