Fogged windows – how to deal with this problem?

Fogged windows in our house are not always a sign of a faulty window. There are many factors that influence this phenomenon, and there are ways to deal with it. It is worth knowing what fogging of windows means from the inside and outside and between the layers of glass in order to effectively counteract it.

When we observe windows fogging from the inside, it is usually caused by high humidity in the room. This phenomenon is often related to improper ventilation in our home. Windows are the coldest internal elements of our apartment, so water vapor in contact with them condenses, creating an evaporation effect. Similarly to steaming mirrors in the bathroom, this phenomenon may occur when the air in the rooms is too humid, for example as a result of cooking without proper ventilation.

Fogged up windows

To avoid this problem, ensure fresh air access to the rooms through air vents, opening windows or using appropriate ventilation. This is especially important when cooking or drying laundry, when air humidity increases. Then it is necessary to air the rooms regularly. Fogging of windows from the outside is a natural process that occurs in spring and autumn, when the temperature difference between the inside of the house and the outside is significant. In addition to temperature, this phenomenon is also influenced by air humidity. High humidity and falling temperatures at night can cause your windows to become covered with dew in the morning. External factors, such as vegetation or air movement, may affect the intensity of window fogging from the outside. Therefore, this phenomenon may be more visible on the north side than on the south or west side of the building.

How to avoid fogging of windows in your apartment?

To prevent fogging of windows and excessive humidity in rooms, you can follow some practical tips. Maintaining a constant temperature in rooms and controlling air humidity are key factors. Additionally, maintaining proper ventilation and following a few basic rules, such as avoiding drying laundry in the apartment, can help maintain appropriate conditions.

Design methods for foggy windows

To effectively deal with the problem of window steaming, design solutions can be used. Installing radiators under the windows, directing warm air towards the glass, and using an appropriate masking in the case of roof windows can help minimize condensation. Ensuring proper operation of ventilation ducts also plays a key role in preventing windows from fogging.


Fogging of windows inside our house may have various causes, but in most cases it results from inappropriate air humidity or a large temperature difference between the interior and exterior. With proper ventilation and maintaining the right conditions, this problem can be effectively dealt with. In case of fogging between the layers of glass, it is necessary to replace the window. It is important to understand that controlling window fogging requires attention and care for appropriate conditions in our home.

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