After days of rain, you might start to notice the signs. The bathroom stays damp long after a shower. Windows remain fogged up. There is a faint musty smell when you open a cupboard.
That is exactly the kind of environment in which mould thrives.
In many homes, particularly during wet or humid weather, moisture builds up faster than it can escape. Once surfaces stay damp, mould can appear sooner than most people expect.
While there are plenty of familiar tips around cleaning and ventilation, one simple habit from overseas offers a slightly different way of thinking about mould prevention.
In Germany, airing out your home is part of everyday life. It is called lüften, which simply means letting your home breathe.
The idea is not to leave a window slightly open all day. Instead, it involves short, deliberate bursts of fresh air by opening windows wide for a few minutes and then closing them again.
It might feel counterintuitive, especially in winter or during cooler weather. But the goal is simple: move damp air out quickly and replace it with drier air before moisture settles on walls, ceilings, and windows.
In tightly sealed homes, this quick exchange of air can make a noticeable difference.
To test out lüften at home, you do not need to change your whole routine. It is more about how you use the windows you already have.
A wide opening is generally more effective than leaving windows slightly ajar.
Open windows or doors on opposite sides of your home to help move air through the space.
After showering, cooking, or drying clothes, moisture levels are often at their highest.
Morning and evening can work well as simple reminders to air out your home.
If your apartment only has windows on one side, a standing or ceiling fan can help move air towards the opening.
This approach is less about constant ventilation and more about short periods of effective airflow.
Many newer homes are designed to keep heat in during winter and out during summer. That helps with comfort and energy use, but it can also trap moisture indoors.
Humidity behaves differently to temperature. Damp air can make a home feel colder and harder to heat. When moisture settles on cold surfaces, it forms condensation, which can create the conditions mould needs to grow.
Letting in fresh air won’t usually make your home feel cold for long. In fact, in some cases, it can help your home feel drier and more comfortable.
There are limits, however. When the air outside is just as humid, such as during extended periods of rain, ventilation alone may have only a limited effect. During those times, it is often about managing what you can and waiting for conditions to improve.
During long periods of rain or high humidity, moisture can build up indoors more easily. Without adequate airflow, that moisture settles on surfaces and remains there.
You may notice it in:
Once these areas stay moist for long enough, mould can begin to develop, sometimes unnoticed behind furniture or inside storage spaces.
If mould does appear, you don’t always need to reach for chemicals. Small patches of mould are easier to manage when addressed early.
For minor areas on hard surfaces:
Some people also use diluted vinegar, depending on the surface. The key is to remove the mould rather than simply covering it up.
If the mould keeps returning to the same spot, it is often a sign that excess moisture remains.
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Humid weather can make any home feel more difficult to manage. A simple habit like lüften, combined with everyday moisture-control measures, can help reduce the risk of mould before it becomes a bigger issue.
While not every situation can be prevented, understanding what you can manage yourself and what may be a building-related issue can help you respond with greater confidence.
If something does not seem right or mould keeps coming back, raising the issue early can help get the right support in place.
This article is edited by Lauren Shaw Regional General Manager and Licensee-in-Charge on July 2026.
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