That's a heck of a system. I like how the no heaters is almost an afterthought at the end. Although, maybe that shows it's just one of the more obvious rules there. We at least need to do that much here.
Avg January Hi/Lo Temp, Durham NC:
48/27 with 0 - 13 mph winds
27°F with those winds = 27°F to 16°F windchill
Avg January Hi/Lo Temp, Ames IA:
30/12 with 2 - 18 mph winds
12°F with those winds = 12°F to -5°F windchill
It's much more difficult to sleep outside without a heater in Ames, IA than Durham, NC. I know it can be done, I've done it. But for people that haven't and don't know how to prepare, there's a legit risk of frostbite which would end tent city just as fast as a heater fire.