Have you ever wondered how an igloo can keep anyone warm especially in temps of -65? Oddly enough it all has to do with heat and how it moves. Since heat rises the entrance is built lowest the next level is the living space which is higher than the entry, then the sleeping loft is yet another foot higher which is where the most heat will be, the heat itself is body heat. Additionally the shape of the igloo and the snow it is built from aid in heat retention, the snow is 95% trapped air making it excellent insulation. When built properly an igloo can be 40-60 degrees warmer than the outside depending on weather, the body heat of the people inside and the thickness of the walls.
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