Indeed. Brutalist architectures would work well in Northern Europe, not much in the south when you have both hot summers and cold winters were heat AND cold spread over.
Thick brick/stone walls would protect you both from the heat in summer (down to 15 degrees colder as it's crazy as it sounds) and from chilly winters if you got a bunch of blankets.
If anything, they are great examples of what happens when civilations break down.