I used the hot hand last winter when we lost power for three days in the South Sound area. I wrapped them in paper towels and then put them under another layer. I only had a Leopard Gecko then though, and she didn't try to burrow down to them.
My plan for my BPs and Corns is to stock up on water bottles and heat the water on my camp stoves. I make a lot of candy, so I have plenty of candy thermometers and can get the water to precise temperatures.
For long term outages, I kept a few fish shipping boxes from work, they're styrofoam shipping boxes. I'll cut some air holes, put the water bottles in the bottom and then put the snakes either in bags or kritter keepers on top of the water bottles. I haven't tried it yet, but as long as the water temperature is controlled, it should work, and not burn them. Luckily I didn't lose power this storm, but my lights were flickering for hours.
http://www.amazon.com/Sunbeam-1773-5.../dp/B000SP3BIU