Cooking, showering, breathing – and sweating in summer but also enjoying Bet22 the most in this time of the year: Each of us releases about 1.5 to three liters of water into the air. Proper ventilation is especially important in summer. Here are the reasons:

  • When outside temperatures are warm and muggy, the humidity in the indoor air is also particularly high.
  • In summer, fungal spores find ideal conditions to spread. “From a relative humidity of about 70 to 80 percent directly on a wall, mold can grow. For this to happen, the wall does not have to feel damp, nor does condensation have to be visible. This only happens at a relative humidity of 100 percent,” explains the consumer center.
  • Stale air contains too little oxygen and too much carbon dioxide. This can lead to fatigue, headaches and concentration problems.

A humidity of 40 to 60 percent is ideal. A hygrometer helps you keep an eye on the values inside the apartment. Above 60 percent is clearly too humid and a sign that you should open the windows as soon as it gets cooler outside.

Otherwise, the following applies in summer: little exertion, plenty of fluids and cooling down whenever possible.


Depending on the outside temperature, there are different strategies for getting fresh air into the home. While in summer the outside air is warm and humid, in winter it is cool and dry.