Comments by "" (@dutchman7623) on "American Reacts to 8 Things That Happen Only in Germany" video.
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When you go to bed, you turn off the heating, or even an hour before. In the morning you 'open' the bed and open the windows, so all moist can ventilate out of the house, beds and furniture. After an hour or two, close the windows and slowly start heating the house again.
Breathing, cooking, transpiration, plants, flowers, animals, all brings a lot of moist into a house and condensation on the walls will cause molds in no time. Outside air is always dryer than used inside house air, even when it rains, all over Europe that is.
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