It calculates the expected relative humidity at a temperature ("inside"), if the temperature and humidity is at given values ("outside").
If the humidity is below 65%% the number is shown in green, otherwise red. Humidity should be less than 65%% to prevent mold growth.
It gives you a good approximation for the expected humidity after ventilation at the assumption that the air is completely exchanged.
An ideal model is assumed, you can think of a bottle full of air: the air in the bottle has a certain temperature and relative humidity (labeled "outside" in this app), if you now change the temperature of the air in the bottle, the relative humidity will change to a new level (labeled "inside").
Temperature unit °C or °F can be set in Settings menu screens.
Tags: weather air airing ventilation cellar basement mould mold window
Tags de: wetter lüften keller schimmel fenster luftfeuchte