Why can a man in Lapland live in a log cabin with 15 cm wall thickness WITHOUT insulation at minus 30 degrees and spend his life in WONDERFUL RADIANT HEAT??????
You could have just as well taken an igloo as an example. However, the problem is always the same: the shell is insulation in any case. That also applies to snow. The only question is how efficient the insulation ultimately is. Snow walls will melt if it gets too warm.
Wood is also a good insulator; that’s why wooden houses have thinner walls than solid houses to achieve the same insulation value. However, the disadvantage of wood is that it does not store heat well. Some prefab house manufacturers have therefore developed walls that have a brick layer on the interior side to compensate for this drawback.
When you stand by a campfire, it also gets warm. It’s only a question of the energy you are willing to expend. You definitely cannot build an energy-saving building with 15 cm. There is an exception: there is a manufacturer who builds 4 cm thick insulation panels that insulate as well as a 30 cm thick styrofoam panel. However, these are based on the principle of vacuum insulation and are therefore very expensive.
A passive house or zero-energy house should theoretically be able to do without heating because the insulation is so good that hardly any heat is lost.
What can I say, maybe you shouldn’t just spread Konrad Fischer’s wisdom, but try it out yourself. When you have spent some hundreds of thousands and are living in your uninsulated house, we can talk about energy consumption again. Basically, I am open to new ideas. But they should also be realistic.