There are many reasons why caves are warm in winter and cool in summer, but they are mainly due to their thick walls, thick roofs and narrow doors and windows.

Thick walls and roofs can effectively prevent hot air from entering the house in hot summer, and narrow doors and windows play an important auxiliary role;

In the cold winter, it is also because of the comprehensive function of walls, roofs, doors and windows that the hot air in the cave is not easy to leak out. Compared with traditional houses, it can naturally be called warm in winter and cool in summer ~