In thinking through my brewing procedures to make them more sustainable in the new place, I've been looking at how best to organize fermentation. What I'm imagining are a few (~3-4) large coleman coolers (the big kind) stacked one on top of the other, each fermenting its own beer, or just holding sanitizer ready to be used later. For temp control, I was thinking to run a small stainless coil in through the drain spigot. Since they're insulated it should be relatively easy to keep them at a reasonable temp. Any downsides to this set up?