Windows wide open and venting like mad is NOT always a good idea!
Hot air can store more water than cold air. If hot, moise air gets into a cold basement, there's the chance of the cooled air being not able to store the contained water anymore. Thus, on a hot day you might pull water into the house instead of transporting it out.
This app helps you venting the house. Just set the right temperature and relative air humidity (the app will try to get that information if you have an internet connection). Now you can see the red line, which tells you the lowes possible basement temperature to get the humidity out of the building.
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