I spent a winter doing geophysical surveys in the Northwest Territories in Canada. (If you have ever seen the show Ice Road Truckers on the History Channel, I drove that road several times that winter.) We were living in plywood shacks with an average temperature of -30°F and the lowest it got was -70°F. In the spring when it got up to +10°F, I was walking around in a flannel shirt! Taking a dump in an outdoor latrine really makes geophysics in those conditions challenging.
Our instruments used mercury cell batteries. The problem with mercury cells is that they don’t work when the temperature is much below freezing. So, I put the battery pack in my crotch, since that was the warmest place around, and ran a cable to the instrument. An advantage of this was that I knew it was time to get inside when the instrument began to go flaky.
Our plywood shacks were heated by a pot-bellied stove. The stove pipe went out through a large hole in the roof. There were double bunks, and the temperature differential was amazing. Snow tracked in on the floor never melted. The guy in the bottom bunk was in an arctic sleeping bag while the guy in the top bunk often had no covers at all. My first doubts about whether I was in the right profession came as I was standing naked, my feet freezing, as I did a sponge bath, using snow melted on the stove, while snow was drifting through the hole in the roof onto my head.