Sitting north facing south is one of the architectural principles of traditional geomantic theory. According to the theory of Yizhan, the south is lush with vegetation and abundant yang, and it is the supreme position to be king in the south.
The ancients thought that the north was yin and the south was yang, and the place with good feng shui should be harmonious between yin and yang. As early as the primitive society, China ancestors built village houses facing south. Most of the ancient houses found in modern archaeology face south.
There are three reasons for choosing a house facing south: 1, good lighting. "House Classics" says that indoor lighting is better where the windows face south, southeast or southwest. Sitting facing south can make full use of sunlight, which is warm in winter and cool in summer. 2. Good ventilation. Sitting facing south will make the air in the room fully circulate. 3. Avoid the north wind. Sitting facing south is not only for the glory and ventilation of the house, but also to avoid the north wind. China is a country with monsoon climate. The continuous invasion of Siberian cold current in winter and the gradual change of Pacific cool wind in summer lead to the changeable monsoon direction throughout the year.