Is hell endothermic or exothermic

Personally (without anything to back it up) I think its a wastland of fire... To say that it is nothing but fire. although the way you describe it it brings to mind the "Mad Arab" Abdul Alhazred and the Necronomicon

http://www.reocities.com/clorebeast/necpage.htm
http://www.reocities.com/clorebeast/nechist.htm

Perhaps hell is a desert. for the desert is nothing but a daytime inferno, and night time ice chill.