@msh @thomasfuchs as a Finnish city dweller the coldest we had here in the south was -29 C. Still I had no problems starting the car nor need to adjust the heater in any way, thermostat handles that stuff.
I even drove to a meeting 170 km away without jacket in that weather. No preheating, no warm garage, no external help.
The key difference here might be that I drive an EV with 6 kW cabin heater if you have a sauna you might get the scale. The car is warm +20 C in 5 minutes or even less.