Wait, my body's own heat is enough? Always has been.

Wearing a sweater still makes sense there. To spend less energy.

But in that case it'll be more a matter of heat isolation. Though when such a low temperature exists on the outside consistently, air humidity drops and it sucks heat less. I think it works this way, but that's pure intuition or something, my physics knowledge sucks definitely.

I doubt they could pass the Turing test.

Build your house better

Igloo effect