Lüften

Should I ventilate now?

Ventilation helps you answer this question simply and clearly.

The app compares indoor and outdoor temperature and humidity and calculates whether ventilating will lower or raise the humidity in the room. Instead of complicated tables, you get a clear recommendation: ventilate now or wait.

Especially with high humidity, fogged-up windows, musty-smelling rooms, or a risk of mold, relative humidity isn't the only important factor. What matters is how much water is actually in the air. Therefore, Ventilation takes into account factors such as dew point and absolute humidity.

What the app can do

Ventilation recommendation based on your readings
Enter indoor and outdoor values
Compare temperature and relative humidity
Calculate dew point
Display absolute humidity
Assess whether ventilation lowers room humidity
Simple explanation without jargon
Start 7-minute cross-ventilation
View your measurement history
Helpful for living rooms, bedrooms, bathrooms, basements, and offices
Why relative humidity alone can be misleading

For example, the humidity outside can be 80%, yet the outside air is still drier than the indoor air. This is because warm air can hold more water than cold air.

Therefore, Ventilation doesn't just use percentages but considers the actual amount of moisture in the air. This helps you better determine whether ventilation is currently advisable.

Typical questions Ventilation helps answer:

Should I ventilate now?

Will ventilation lower the humidity right now?

Is the outside air drier than the indoor air?

Why is my room damp despite ventilation?

When should I ventilate the basement?

What is the dew point?

Is there a risk of mold due to excessive humidity?

How does the humidity change after ventilation?

Who is the app for?

Ventilation is for everyone who wants to better understand indoor climate:

Tenants and homeowners
Families
People with damp basements
Hygrometer users
Anyone who wants to prevent mold
Anyone who wants to ventilate properly instead of just going by feel
Important

Ventilation does not replace a professional assessment of mold, structural damage, or persistently damp walls. The app helps you better assess temperature, humidity, and dew point and make informed ventilation decisions.

In case of visible mold, water damage, or persistently high humidity, the cause should be professionally investigated.

In short

Ventilation is your easy calculator for room humidity, dew point, and proper ventilation.

Enter values I received a recommendation: Ventilate better.