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• a  (of a chemical reaction or compound) occurring or formed with absorption of heat

• Thus, counterintuitively, Hell might be endothermic, as any other large mass black hole would be.
• Better yet, if memory serves, that would be an endothermic reaction, thus leading to a "Cold-Pickling Boundary Layer.

• endothermal
• heat-absorbing

• exothermic

News & Articles

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• Dinosaurs Might Have Had Warm-Blooded Animals' Fast Metabolism
  Evidence is mounting against claims that dinosaurs could not have been endothermic, including a new analysis of fossil microstructures found in ruminants, lizards, dinosaurs and crocodiles -- Read more on ScientificAmerican.com
  Feb. 14, 2014 - Scientific American