At the same time, the rules that need to be observed in order for plastic windows to serve for a long time are not so complicated.
It is difficult for a person to breathe if the humidity in the room exceeds 50%. Accordingly, this indicator needs to be monitored. Check how well the natural ventilation works is in a simple way by putting a sheet of paper to the ventilation duct. The sheet resisted? So the ventilation is in perfect order. In any case, daily the room needs to be ventilated twice for 15 minutes so that excess moisture does not accumulate.