Mold - what do you have to pay attention to when airing?

Sufficient and proper ventilation is one of the most important preventive and additional measures that should be taken into account when dealing with mold. How to properly air, what to look for, and what options there are to save yourself from airing by hand, you will learn in this post.

Purpose of airing

Ventilation should not only restore enough oxygen to the rooms, but also remove moisture from the rooms. Since moisture is the main cause of mold formation, one must be particularly careful with the airing, especially in the case of imminent or incipient mold attack.

Basic rules for airing

  • Ventilate rooms according to use (frequency, duration, etc.)
  • Always allow moisture to evaporate immediately
  • Check humidity at regular intervals
  • as possible "jet ventilation"
  • wipe water from walls and floor before venting (bathroom, kitchen)
  • no textile curtains in damp rooms (bathroom, possibly also kitchen)

Ventilate rooms as needed

Every room should be ventilated regularly, but always depending on the type of use. For example, you do not need to ventilate your bedroom during the day, but only in the morning and in the evening if you are not in it. Other rooms, such as bathroom and kitchen, you should always ventilate after use.


Shock ventilation means that you open the windows short but wide, and if possible ensures complete passage. On the one hand this saves energy, on the other hand it ensures the greatest possible air exchange and maximum moisture removal.

Airing in humid weather

If there is high humidity outdoors, you should rather withhold the airing, especially in the warm season. If the outside air is very humid and partly warmer than the room air, you bring more moisture into the room, as you bring out - because then inside the dew point can be exceeded, it can lead to condensation on walls, ceilings and surfaces.

Automatic ventilation

There are several ways to automate the ventilation of rooms, so you do not always have to open and close the window by hand at regular intervals by hand. These possibilities are:

  • Automatic window ventilators in the frame (also possible with heat recovery)
  • central ventilation system in the house (possibly with heat recovery as in the passive house)
  • Programming ventilation patterns for automatic roof windows


Forced and continuous ventilation can certainly lead to high heat losses and increased heating requirements (more heating costs) if they do not have built-in heat recovery.

Moisture peaks not covered

It must be remembered that moisture peaks (for example in the bathroom and kitchen) can not be sufficiently counteracted by automated ventilation. With such high amounts of moisture, you must always immediately open the door by hand (open the window on the passage), otherwise the moisture can be disposed of insufficiently.

Tips & Tricks

Centralized ventilation systems with heat recovery, which are almost standard in passive houses, can help to significantly reduce heating costs, as the heat in the room is "recycled" by up to 95%. This means that only 5% - 10% of the heating requirement must be applied during the heating season. Small systems (eg heat pump for additional heating of the incoming air) are often sufficient for this.

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