Lüften

Lüften (German for air a room) is a helpful app which is intended to show the best time to open windows and when to better keep them shut to optimise the humidity in your rooms. It also gives you a great overview over all temperature, relative humidity and CO2 values of HomeKit™ and Netatmo™ weather station sensors in your home. It is especially helpful to keep humid rooms like cellars as dry as possible.

For each sensor a symbol is shown, when to best open a window or keep it shut.
- open window yellow dot: the air quality should improve, but depending on accuracy may get worse and thus should be monitored
- open window green dot: humidity will improve
- open window 2 green dots: humidity will improve quickly
- If there is no symbol, the humidity will stay in the optimal area.