What should we pay attention to in semi-underground duplex apartment Feng Shui?

Choose a layer, one layer is too turbid. There is heavy air within one meter, mostly carbon dioxide. Don't choose the ninth to eleventh floors as the stratosphere, where dust circulates in suspension and buildings will stay for a short time. Don't choose 18 floor. As the saying goes,18th floor is hell, and19th floor is heaven. It's a little superstitious. Don't choose the top floor, the so-called high place is too cold, and some buildings will have waterproof problems. There is also the problem of rain noise. If the north and south are transparent, you can choose more than 4 floors. The higher the field of vision, the wider the field of vision. If there are windows, choose 3 or 2 floors, which are warm in winter and cool in summer.