The colder it is outside, the wall in the window will die. What's going on here? What's going on here?

Influence of thermal expansion and cold contraction. The colder the weather outside, the wall in the window will die because of the expansion of heat and contraction of cold. In architecture, a window refers to a hole built in a wall or roof to let light or air into a room. As early as the Sui Dynasty in China, there were windows that could be opened and closed automatically in the Guanwen Temple in the Wei Zi Palace.