Max is 70*C, Min- i don't think they really have a minimum, i'll check it out and get back to you

EDIT: I don't think there is a minmum, if anyone has read the tom's hardware 5Ghz project, they recorded -196*C. More than enough to cool my beer!
I'm guessing they would not be able to go much below 5~10*C otherwise condensation may occur and damage the motherboard components.