Why does feng shui say that the house can't be empty all the time?

Feng Shui Analysis: Why can't we live in a big house? -common sense and scientific explanation can better explain the problem. For example, there is a family's wedding room somewhere. In order to reflect the width, a wedding room covers an area of 100 square meters, covering an area of more than 3 meters. Because of having children, it has changed from a wedding room to a nursery. One winter, it was snowing. I was lucky enough to sit in that room for nearly an hour and experienced the room temperature personally, which gave me the impression that it was "cold". Later, the old man in my master's house asked me how I was doing. The first sentence I gave him was: I need to change to a small room to raise my children. There is a room only a few square meters next door, which is the best room for raising children. The reason is: a small fire can't raise the temperature of that big room, and a big fire is definitely not good for raising children and has hidden dangers. According to the physical phenomenon of "heat floating and cold sinking", the floor space is high, and the thermal temperature is empty on the upper floor of the room near the roof, and the bottom floor is "cold". If the space is too large, it is extremely difficult to heat the whole room to the ground floor. When the window is closed, there is a problem with air circulation, and it is more difficult to ensure the temperature rise when opening the window. However, a small room is different. Small fires heat up quickly, and opening windows can also ensure air circulation. But raising children, keeping warm in winter and air circulation are a big contradiction. Only a small room can be a comprehensive solution that organically combines these two aspects. Therefore, the "big living room and small bedroom" put forward by the ancients is a perfect scheme combining the four seasons of spring, summer, autumn and winter and the comprehensive consideration put forward by adults and children. There are scientific reasons and factual basis.