Is hell endothermic or exothermic

Here is a question i found while searching the web some time ago. Is hell endothermic (absorbs heat)or exothermic (releases heat)? Some people/places/literature speak of hell as a frozen wasteland. others talk of hell as a fiery pit where you burn eternally. What do you think? Dnd please at least respond with a reason why you think either way :P (something to remotely back up what you say).