Word has gotten around that it is better not to tilt windows for a long time, but rather to open them completely and then ventilate them briefly. This is called shock ventilation or, if you open opposite windows, cross ventilation.
In spring or autumn, a complete air exchange can take 15 to 20 minutes and if you do this three to five times a day, the windows will have been open for quite a long time. This tactic no longer works in winter because the outside temperatures are too low.
However, it is advisable to ventilate just as often, even when the temperature is below zero three to five times per day. However, that’s enough three to five minutes with the window open. This can be used as a reminder: 5×5 rule derive: Translated, this means ventilating five times a day for five minutes.
This is easy to do when you are on vacation at home or on the weekend, or if you work from home a lot. However, if you are not at home during the day, you need a different strategy. The good news: If you’re away all day, ventilating less frequently is enough. Minimum in the morning and evening, but it’s better to take the one 3×5 rule. Which means Ventilate for five minutes three times a day.
Ventilate in the morning when you get up, when you come home from work and again just before going to bed.
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