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Condensation on the window? Four tips on how to avoid wet windows in the morning


Condensation on the inside of the window must be removed quickly, otherwise the risk of mold increases. But what is the cause - and how can you prevent it? 

Condensation on the inside of the window must be removed quickly, otherwise the risk of mold increases.

But what is the cause - and how can you prevent it? 

Especially in winter, the window panes are often wet on the inside in the morning.

The window fogs up and tiny water droplets form.

This physical phenomenon is condensation water, also known as sweat water.

But where does the water come from and do I have to do something about it?


If condensation forms on the window in the morning – be sure to wipe it away.

Otherwise mold can form.

© Shotshop/Imago

Why does condensation form inside the window?

It is completely normal for condensation to form on the window panes, especially in winter.

After all, up to 1.5 liters of water per person is formed within eight hours just by breathing and sweating, which can then condense on the windows.

Added to this is the moisture from showering or cooking.

"If the warm air hits a window pane that is cold due to the low outside temperatures, the moisture condenses and settles on the inside of the window in the form of condensation," explains Ökotest on its



However, you should not completely ignore the wet windows, but should act immediately.

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What to do if condensation forms on the window panes?

If condensation forms on the inside of the window pane, it should be wiped away with a cloth.

Otherwise mold can form on the seals of the window panes over time, which can be easily recognized by the dark spots in the silicone.

However, the fungal spores are not harmless, as they can cause allergic symptoms such as headaches, coughing or insomnia.

The wooden frame of the window can also be damaged by too much moisture.

If condensation only forms on the window from time to time, according to

the Ökotest

, this is not a problem.

However, anyone who regularly finds tarnished windows should definitely combat the causes.

As a rule, this is excessive humidity in the room.

But also leaky, poorly insulated windows can sometimes be the reason.

In this case, a window replacement is advisable.

New windows with thermal insulation glazing not only prevent regular condensation, but also reduce energy consumption, which in turn reduces your heating costs.

"Modern window systems that comply with the Energy Saving Ordinance (EnEV) are also available with an integrated ventilation system, which in turn contributes to climate control in the home," says energy provider


on his website.

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How do I avoid condensation forming on the inside of the windows?

Your windows are intact - and yet condensation forms regularly?

Then you should definitely reduce the humidity in the living rooms.

Humidity of 40 to 60 percent is ideal.

With a hygrometer, the humidity can be checked very easily and is available from around 10 euros in hardware stores or online shops.

  • Heat properly: The room temperature should be as constant as possible to prevent condensation from forming on the panes in the first place.

    If you heat your bedroom or study less, for example, you should make sure to keep the room doors closed so that the moisture does not condense in the cooler rooms.

    This also prevents mold on the walls.

  • Ventilate properly: The most effective remedy for high humidity is still proper ventilation: "Airify three to four times a day for about ten to 15 minutes," advises



    It is essential to ventilate the room regularly or – even better: cross-ventilate – and not just tilt the windows.

    With tilted windows, the air exchange is far too low and the walls cool down.

  • Drying laundry on the balcony: When drying laundry, the water from wet clothing is released into the air in the room.

    Wet laundry on the drying rack therefore massively increases the humidity in the room.

    If you can, you should put your drying rack on the balcony, in the garden or in the attic - even in winter.

    Especially in the bedroom and living room, the drying rack is taboo if you want to avoid mold growth on window seals and walls.

  • Switch on the extractor hood: A lot of steam is also formed when cooking.

    Therefore, if possible, cook with the lid on the pot and switch on the extractor hood.

    The latter extracts moisture from the air and directs it outside to the outside.

  • Do your window panes fog up from the outside in winter?

    Then you don't have to worry, because condensation on the outside of the window is a good sign and shows that your windows are well insulated.

    List of rubrics: © Shotshop/Imago

    Source: merkur

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