Hello, facing south, feng shui is good. Large windows can be opened on the south and southeast walls, so that you can get more sunshine in winter and cool breeze in summer. I believe that the cool air conditioning in summer is not as cool as the natural ventilation. In other directions, such as northwest and west, small windows should be opened to reduce the exposure of sunset and northwest wind. Of course, the size of the window is determined according to the size of the room, and the height of the window is also determined according to the owner of the room. If it is the master bedroom for the elderly or children, it is suitable to design large windows, which can let more sunlight scatter in.
I hope I can help you.