For temp heat in a pinch, I've used the ThermaCare Heatwraps for neck/knee and back... Heatwrap pads are larger than most hand warmers, last about 8 hours. Back size will heat wide strip along back of tub. I've used them with plastic tubs and a file carrier that I use to take my snake to the vet.
I usually set a plastic tub on a ThermaCare pad, with the pad wrapped in a pillowcase, towel, small sheet, etc. to avoid overheating. Heatwrap pads can get HOT, so no direct contact with snake and check temps frequently. Temp guns rule. Also snakes in pillowcases inside small styrofoam coolers with small heatwraps in bottom---plus separating towels, sheets, newspaper, etc.---will keep warm. But again, check temps frequently.
Snow here in Atlanta and a cold week ahead, so I feel your pain. Got my ThermaCares and other emergency supplies in the snake room.
Good luck!
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