Wrong about what exactly?
All I know is that when I put my specs on to trim my beard they steam up. If I open the window they clear.
Now get off your high horse and explain please. And stop being so arsey.
Wrong about what? Really? Wrong about offering advice to open windows to deal with condensation! You really are a hypocrite. You bring this thread down by calling me a jumped up extractor fan salesman and then have the audacity to call me arsey. Your question is so unsophisticated it is laughable. If the internal temperature of a building is 21 degrees centigrade then the internal building fabric temperature is related to that ambient temperature. If you then open a window and let in cool air at say 5 degrees centigrade then the internal ambient temperature reduces and causes two significant issues.
1. The air immediately has to give up moisture in the form of condensation because warm air holds more moisture than cool air. (This moisture has no time to escape from an open window, the effect is immediate and I'll say it one more time for your benefit... Transient condensation!
2. Because the internal ambient temperature is reduced by the cooler incoming and uncontrolled air flow then the building fabric temperature is also reduced by the cooler air.
This is quite a simple concept that I don't really think needs explaining but lets explore your knowledge now by getting you to answer my earlier question that you conveniently ignored. How do you know when a room is 'full of condensation?'