“An important reason why cave dwellings are warm in winter and cool in summer is that they have a thick “roof”. On the roof of cave dwellings in northern Shaanxi, pedestrians, horses, and even heavy vehicles can walk. It is a brick kiln, and the top is also covered with a thick layer of soil, so that the cave can be kept warm and insulated, just like an air conditioner." In addition, the roof and walls of the cave can neither directly absorb heat from the atmosphere nor absorb heat directly from the atmosphere. It dissipates heat directly into the atmosphere, and only the entrance of the cave dwelling can directly contact the outside world. Therefore, the temperature changes in the cave dwelling always lag behind the temperature changes outside, and the temperature difference does not change much. On the northern Shaanxi Plateau, a farmer works hard all his life, and finally Their basic wish is to build a few cave dwellings. In their opinion, how well the cave dwellings are built is related to the good and bad fortunes of future generations. Cave dwellings are made of soil, bricks, and stones, and there are also differences such as brick-hanging surfaces and stone joints, and the costs vary. More or less shows the wealth of the host's family. In the past, before a man married a woman, the woman would go to the man's house to "see the place", that is, to see how many cave dwellings the other party had and what material they were made of, so that the family background of the other party could be seen at a glance. Earth Cave Dwelling Construction It's easy. You can cut holes in the cliffs and install doors and windows in front of the hillsides, and it will become a cave. Usually, the lifespan of an earthen cave dwelling can be lived in for two generations. After that, the loess layer gradually peels off and it can no longer be inhabited. , you may wonder whether it is very dangerous to live in a cave dwelling. Will it collapse? On the Loess Plateau, thousands of years of rain have formed thousands of ravines. The clay and minerals make the soil here very solid and deep. The loess is one to two hundred meters long, extremely difficult to seep water, and highly upright. It can be dug at will without collapsing, which provides a good building prerequisite for cave dwellings. Most of the roofs of earthen cave dwellings are hooped with willow bars. , to prevent the soil from collapsing. However, if there is a flood or landslide, the risk of collapse is always devastating. Therefore, when building a cave dwelling, it is very important to choose the location to build the cave. (Because my home is in northern Shaanxi Suide)