2. It's humid weather in March. Open the window. Why are there water drops on the indoor tile wall?

Is it because you were cold a while ago, but now you are getting warmer? Simply put, the temperature of ceramic tiles at home is relatively low, while the outdoor temperature is relatively high. When cold tiles meet warm air, they will condense into water droplets on the surface of tiles. For example, if you take out a drink from the refrigerator, there will be water droplets on the surface of the drink after it leaves the refrigerator. This is the same reason. It is normal for tiles to have water droplets, but it is really a headache for people with rheumatism. Just wipe the water drops on the dado with a dry cloth and mop the floor with a dry mop. I suggest you turn on the air conditioner and blow some hot air to dry the room. If the house was paved with heating bricks, this would not happen.