I had an idea today. My fermentation area in the house is a little cubby behind the coat closet/under the stairs. We mostly use it for seasonal decorations storage, but there's enough room for a few fermenters. What I don't have room for is a fermentation cabinet. This little void in my townhouse happens to be on an exterior wall. I was thinking of burying a copper coil in the ground, drilling holes in the wall to run lines into the little void in my townhouse and then connecting those to another coil in the fermenter. I would circulate water through it with a pump that would be plugged in to a temp controller. I can get the copper for next to nothing. Seems to me like it'd work within certain limitations. Any thoughts?