Will the fourth floor in Hangzhou be wet in winter?
If the ventilation system of the building on the fourth floor is good, the temperature difference between indoor and outdoor is not big, and the building materials are moisture-proof, then the building on the fourth floor is unlikely to be wet in winter.
However, if the building on the fourth floor is poorly ventilated, the temperature difference between indoor and outdoor is large, or the building materials are not moisture-proof, then the building on the fourth floor may be wet in winter.
Therefore, if you live on the fourth floor of Hangzhou in winter and are worried about the humidity in the room, it is suggested to check the ventilation of the room to ensure the indoor temperature is suitable and check the moisture-proof performance of building materials. If the problem persists, consider using dehumidification equipment or consulting a professional.