What's with the shady room?

1. Orientation of the room. If the exterior wall of a room is difficult or has no sunlight, it will be cooler than other rooms, especially the sun room. 2. Geo-atmosphere, usually caused by geographical environment, usually appears at the bottom. The moisture on the ground rises again under the pressure of hot air in the upper layer, and then stays indoors. 3. Wall cracks. If there are small cracks in the wall, it is easy to leak air, especially the small cracks that are invisible to the eyes. There was a leak upstairs, and your roof didn't crack, and then the water came in.