They weren't in a vacuum, though. The air was very slowly leaking out, and that leak was moving the heat energy out of the room...but the thin air still could draw the heat from the body. You're absolutely right that in a vacuum heat stays in because thermal diffusion (conduction) only can happen between a solid, liquid or gas, though. Also, you can lose radiative heat in a vacuum, though that wouldn't be much at all.
I was hoping they might have sunburns, for realism.
I really loved the episode. The intruduction of Admiral Adama's ex wife was a fascinating window into his past and also explained quite a bit about his relationship with Lee and Zach. I'm always happy to get more back story. Also, the law books not only act as an anchor for Lee, but a tie in to the much anticipated "Caprica" series.
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