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Mold likes it damp and calm, so experts advise targeted ventilation to remove room moisture. Sounds logical. But what happens on rainy or foggy days when the humidity outside is high? Does it make sense to ventilate these days, too, or does this only increase the humidity indoors? The answer to this question is yes; you should also ventilate on these days.
Ewald Gärber is an expert in the areas of building, living, and energy at ‘Die Umweltberatung’: ‘Yes, it also makes sense to ventilate in humid weather because, in this case, you also reduce the humidity in the interior in relation to the outside air. Let’s take an extreme case: a foggy day where the humidity outside is around 95 or 100 percent, but that’s the relative humidity. If you now ventilate this relatively humid air into the room, this relative humidity is greatly reduced by the heating. A cubic meter of air can absorb much more water without condensing at higher temperatures. That’s why it definitely makes sense to ventilate even in humid weather.’
Another important aspect that speaks in favor of regular ventilation is that you reduce the CO₂ in the indoor air and thus improve the air quality.
- source: kleinezeitung.at/picture: hp
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