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Air humidity in rooms – measure, increase, decrease

A good humidity in the rooms contributes decisively to our well-being. If it is significantly higher or lower than the recommended values, it can even harm our health in the worst case. But what values ​​are ideal and how can I increase or decrease the humidity when in doubt? We have the answers.

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In this article
Optimal humidity
Table of recommended values ​​for a pleasant indoor climate
Measure the humidity of the air
When you increase the humidity, it should be too low
The way you lower the humidity must be too high

Relative air humidity, absolute air humidity, maximum air humidity … Anyone who deals with the subject of air humidity in its four walls meets quickly a variety of bulky technical terms and specialist knowledge. The good news: no one needs it in everyday life. All you need to know is: Air humidity, also called air humidity for short, defines the proportion of water vapor in the ambient air ; and it should not fall below or exceed a certain level.

Optimal humidity

As a rule, the optimal humidity is around 50% – at an ambient temperature of 20 degrees Celsius. However, it is not as simple as it seems at first glance, since the optimal humidity of the air differs from one room to another. The reasons for this: The ambient temperature of a room greatly influences the humidity of the air. The higher the temperature, the more air can absorb moisture. And usage also plays a role. Cooking and showering daily means that the humidity in the kitchen and bathroom is naturally higher than in the living room or hallway. At the same time, it also means that you need to be especially careful in these rooms to let the created moisture escape through the ventilation.

Table of recommended values ​​for a pleasant indoor climate

space Optimal temperature Optimal humidity
bathroom 20-23 degrees 50-70%
nursery 20-23 degrees 40-60%
living room 20-23 degrees 40-60%
study 20-23 degrees 40-60%
cooked 18-20 degrees 50-60%
bedroom 17-20 degrees 40-60%
corridor 15-18 degrees 40-60%
cellar 10-15 degrees 50-65%

Source: www.luftfeuchter-raumklima.de

Measure the humidity of the air

As we learned at the beginning, humidity defines the proportion of water vapor in the ambient air; if it is too low, for example, there is a risk that our mucous membranes will dry out, if it is too high, mold can form. Neither ideal – and above all: bad for health. So what to do? The solution: a hygrometer. The hygrometers provide very accurate results of the relative humidity of the air in the respective room. Good devices are available for around twenty euros.

And one more thing: if you want to know if the humidity in your house or apartment is within a reasonable range, it is not enough to measure it once. Repeat the process; You only get a reliable result after repeated measurements.

The easiest way is to use an ambient climate sensor like the "Air" from Bosch. Every five minutes, it measures the quality of air, humidity, temperature, but also brightness and volume. It displays them as easy-to-understand colored symbols directly on its surface and also sends the data in parallel to the associated smartphone app, which can set off the alarm.

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When you increase the humidity, it should be too low

Have you measured the humidity with your new hygrometer and the device shows that it is too low? Not good – but not a drama either. Especially in winter, this can happen due to the heating. As cold winter air outside usually has even less water than in the apartment, ventilation is not an option here. Instead, you can, for example:

  • turn down the heating. Cold air is simply more difficult to transport, which inevitably increases the moisture content of the air – and also allows you to reduce heating costs.
  • place a bowl of water on the radiator. The heat from the heater evaporates the water and increases the humidity in the room.
  • Dry your clothes in the apartment or iron them; in either case, more water is released into the air and you benefit.
  • leave the bathroom door open while showering.
  • Purchasing indoor plants that absorb a lot of moisture (Cyprus grass, linden) gives moisture back to their environment. The only important thing here: don't forget to pour!
  • buy a humidifier. In this case, be sure to seek the advice of a specialist, as many devices differ considerably in terms of quality and performance.

With all the measurements, keep an eye on the development of the air humidity in the respective room. After all, at some point, you don't want to know that you have done too much and that the humidity is too high in the end.

The way you lower the humidity must be too high

If your hygrometer shows a value above 70, the humidity is definitely too high. As a result, condensation can form, often on cold exterior walls or in the window area, which in turn is ideal breeding ground for mold. You can work around this problem by breaking down more often. Ideally, two to four times several minutes a day are considered to be even more common in the kitchen or bathroom. Especially after cooking and showering, you need to make sure to let out the extra air humidity.

If you don't get the desired effect yet, you can also fill salt or cat litter in small bowls and place them in the house or apartment as needed. Salt and cat litter absorb water and therefore remove moisture from the air. Also avoid drying washed laundry indoors and instead try – if possible – to go outside.

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