By "all or nothing" you mean to allow chillers which can go below zero too?
Hm... actually why not?! If we're looking to compensate for the cold climate... - then the criteria could be more about need of insulating the gear or not... DICE, SS, Cascade, LN2, Liquid He all need insulation - and they should belong to the OC and Pro Leagues... air and water of any temp could go to Enthusiast League..
Then it would be simple... do not need control of the temps - insulation, pots, water - blocks can be easily seen on the pictures... And where is suspicion about the actual cooling, mods could request a video...
So, what are the thoughts about these?