The wall there is much thicker than that of that man. If the south wall is 15 20, it is basically 30 40. What we're talking about here is thickness. At present, when building houses in most parts of the north, it is more than 20 to 25, and 15 may be a little thin, because it is basically affordable now. It would be much better to build an extra layer of brick for thermal insulation. As in the past, the thickness of houses in the northeast may be normal to 40, because it is really cold outside. It is common to go to MINUS 30 or 40 degrees when it is cold outside in winter. It can be said that if you take a glass of water outside and throw it into the air, it will turn into ice fog, and if you can't reach the ground at all, it will freeze.
People there can be said to spare no effort to keep warm. The northeast is basically Kang. Even when there is no collective heating, houses are usually built low, because it can better isolate the invasion of cold air. Then his foundation is generally short, even semi-underground, because the northeast is basically not wet, unlike the south, the thickness of the wall will be relatively large, and the windows will be particularly small.
People everywhere have their own way of life. Heating is very popular now, but no one has been here before. It's just that the living standard was really low before, and I can only say that I can survive, but the living standard and quality are definitely different from those in the warm areas in the south, because it's really cold there. If it is a car, it won't catch fire the next morning, because it may be below MINUS 40 degrees at night, and normal cars can pass.