If you wake up in the morning and the bedroom windows are dripping with water, you are not alone. Condensation on windows is one of the most reported indoor climate complaints in the bedroom, especially in autumn and winter. It is not necessarily a cause for panic, but it is a sign that the humidity in the room is too high for the temperature of the glass.
Why does condensation form on bedroom windows?
While sleeping, two people can easily release half a liter of moisture per night through breathing and the skin. This moisture remains in the room's air. Windows are usually the coldest surface in the room, especially single glazing or older window frames. As soon as warm, moist air comes into contact with that cold glass, the moisture settles as condensation. The greater the difference between the room temperature and the glass temperature, and the higher the humidity, the faster and more severely this occurs.
What can you do yourself to prevent it?
- Ventilate before going to sleep and immediately after waking up. Open the ventilation grille or leave the window ajar for fifteen minutes so that the moist air from the night can be discharged.
- Do not keep the bedroom door completely closed. A little air circulation with the rest of the house helps to distribute moisture instead of letting it accumulate in one room.
- Do not keep curtains and shutters tight against the window at night. A closed shutter or thick curtain traps the cold air against the glass, which actually makes condensation more likely to occur.
- Heat the bedroom slightly instead of letting it get completely cold. A slightly higher and more stable temperature reduces the difference between the glass and the indoor air.
- Do not dry wet laundry in the bedroom. This adds extra moisture to the very room where you are already experiencing the problem.
When does a dehumidifier help?
If ventilating and the adjustments above are not enough, for example in a bedroom that is difficult to air out or where multiple people sleep, a dehumidifier can make the difference. The device structurally removes moisture from the air, causing the humidity to drop and simply leaving less moisture to condense against the glass.
Our advice for the bedroom is to look at the AirPure DH251 dehumidifier from Dynter. This device is suitable for running at night or during the day and helps keep humidity at a healthy level, which not only prevents fogged windows but also reduces the risk of a musty smell or mold in the long term.
Condensation by itself is usually not a major problem, as long as you wipe it away regularly and address the cause. If the glass remains structurally wet or you see moisture spots forming on the wall or the window frame, it is wise to both ventilate and actively lower the humidity.