I spoke with a biologist who works with cellular medium. I don't know the field at all but got some interesting general information.
I have always been better in cold environments then hot and maintain body temps better in cold. This as I have been led to believe is an genetic adaptation. When quizzing the biologist she said that the calories burned maintaining body temp at the cellular level are next to nothing. Perhaps 100 a day.
Anyone have any data on this? My searches have yet to yield more data.