This kind of house is full of light, warm in winter and cool in summer. Even in winter, the sun can shine into the depths of the room. In summer, when the sun rises close to the top of your head, you can't feel the strong sunshine in the room.
Moreover, houses facing south have great geographical advantages, so these houses are generally called "first houses", which are for the most distinguished people in China. China has attached importance to filial piety since ancient times, so the main rooms are generally occupied by elders. East-west houses are called "East Wing" and "West Wing" because of poor lighting. This is how we often see the "wings" in novels.
Extended data:
Sitting facing south is not only for lighting, but also to avoid the north wind. But at that time, our ancestors didn't even know that the earth was round, and naturally they couldn't explain the benefits of living in a house facing south, so there was the so-called "five lines of gossip". According to its statement: the east is wood, the south is fire, the west is gold, and the north is water, or the height of gossip is south, the ridge is north, the earthquake is east, but it is west.
In ancient times, when monarchs met ministers and elders met concubines, they all sat in the south, while courtiers or concubines stood in the south, that is, facing the north. Therefore, using "North" to mean that people are courtiers is called "North courtiers". Therefore, palaces and temples all face south, and the emperor's seats all face south, while residential houses naturally avoid due south, due east or due west to avoid taboos.