Anyone ever try using a portable fridge/freezer as a glycol chiller? They are new to me so for anyone else unfamiliar it's basically just a cooler with heat exchange coils wrapped around it and a compressor. Very similar to a chest freezer in design. They come with a 12-volt DC adapter for your vehicle or RV as well as an AC adapter for use at home. There seems to be several manufacturers all making units of different sizes. The one that caught my eye is the Alpicool C20 with a 20 quart capacity. Should comfortably hold 4 gallons of glycol solution which I imagine would be enough cooling potential for 2 fermenters. The lid is removable and I plan to drill holes and run glycol lines through it. One of the main reasons I'm focused on this unit in particular is the design of the interior. Most of the units I looked at had a plastic tub for the bottom half just like a regular cooler. But then about halfway up there would be a seam and the top half would be metal like a chest freezer. This unit seems to have one solid plastic tub. I understand that metal would give a better heat exchange but a plastic tub would be great at holding glycol solution. Price is another consideration, this unit is pretty reasonable at around $200 new. Any thoughts or words of advice before I just order one and start tinkering with it?