Agnar: Heard that story, it’s a cold one. The trick’s simple: use the land as shield, put your shelter against a south‑facing slope and build walls of packed earth or stone. Keep the entrance on the north side and close it with a heavy tarp or a stone slab. Add a small chimney made of a thick log, so the heat rises and creates a draft that pushes cold air out. If you have time, bury a bit of the walls in the ground, like a coffin for the wind. That’s what the old ones used – no fancy gadgets, just the earth and a good sense of place.