Long story short, I'm now the owner of an ancient piece of molecular biology equipment. It is a Perkin Elmer Cetus thermal cycler or PCR machine. What it might allow one to do, is use it as a glycol recirculation system. It was designed to circulate polyethylyne glycol through an aluminum plate and heat or cool the plate from 4°C to 94°C. It would be easy to disconnect the tubes from the plate and hook them to a copper coil for cooling a fermenter or something else.
In the picture you can see the compressor, pump, coils, Al plate, etc. In fact one could basically just keep the unit whole and re-route the plumbing for the glycol. It might work. Any takers for this free thingamagig?