-50C Running Temp

That probably uses Phase Change / Peltier (sp?) cooling. It's an extreme way of cooling components (CPU's mainly).
 
It'd have to be phase change or liquid nitrogen. Peltier does a good job for sub-ambient temps, but it's not enough to get close to running subzero numbers.
 
It is the Prometia 2 Phase Change. It is the exact same system that goes into a refridgerator or air conditioner. Unfortunately, they are mighty expensive.
 
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