Speaking of winter paranoia (power outages), those reptile heat packs won't help much if you don't have the right "insulation". I've successfully gone thru days
without power (or heat to speak of) and all my snakes were fine because they were bagged & kept (& not crowded together) in ice chests or-styro-foam boxes.
I have heat packs on hand, but during that outage I didn't & used jars of HOT water, replaced every 8-9 hours, to keep my snakes comfy around 82*. (I have
a gas hot water heater, but the forced air heat needs electricity; at the time I had a gas log fireplace but all the heat went up the chimney...that's been changed
to a ventless type...just for emergency use.) You can't go wrong having as many ice chests on hand as possible...I didn't even lose any food...my garage was 40*
and substituted for the 'fridge, while my porch kept my frozen foods frozen...that outage was from an ice storm, btw. I pulled icicles off the house & used them
to keep my food frozen too, lol..."whatever works"!
I later heard that as a result of that ice storm (back in '09), many lost their snakes, so I felt very fortunate to have been able to make do & keep all of mine
healthy & safe.