Cover all exposed parts of the body. Build a fire for heat and to attract attention. Place rocks around the fire to absorb and reflect heat. It will lower your body temperature. Melt it first.
Disorientation occurs quickly in wind-driven snow and cold.
To avoid carbon monoxide poisoning, open the window a little for fresh air. Make sure the exhaust pipe is not blocked. After the snow stops falling, raise the hood to indicate trouble. Properly ventilate the building. Close off unneeded rooms.