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I won’t go into detail about the reasons, there can be many. I will highlight the most basic reasons why windows fog up in winter:
high indoor humidity
low ambient temperature
wide window sill, due to which hot air does not reach the window
a cluttered window sill (for example, with flower pots), therefore warm air does not circulate no more towards the windows.
And now the most important thing: how to get rid of condensation on plastic windows.
