Hey,

I would think Heat panels would be better.

http://www.reptilebasics.com/RBI-Rad...p-1-c-283.html

These are from Reptile Basics and they rock. Big apple herp had heat pads that are awesome. These things are great for larger snakes but might not work for Balls.

http://www.bigappleherp.com/Kane-Heat-Mats_2


I live in Chicago so we are not as bad as you but it gets "my nipples are hard enough to cut glass" cold here! I am looking into a few of the mats for my burms.