A lot of those Americans have pets. Many of those pets (i.e. a husky) need climate control 24/7.
They had kennels but they didn’t have doors or anything.
They would nap in the snow and let it pile up to keep them warm.
https://www.coolantarctica.com/Antarctica%20fact%20file/wild...
https://www.alamy.com/stock-photo/hut-shackleton-antarctic.h...