I was in a sauna at +95 Celsius for several minutes the other day. And within the same week I felt -35 Celsius cold on my bare skin.

Both could kill me provided a bit more exposure, but they don’t instantly. Meanwhile, +4 Celsius can also cause death by hypothermia pretty easily in the right circumstances.

So, while I like the idea, I think implementation will be hard as there is no clear death number on either end of the spectrum. Not to mention humidity, clothing, exertion, level of hydration, etc…