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And the first thing that comes to mind is in the matter of the causes of water is the flaw of the manufacturer in the form of a poor -quality product. Although, their fault is also inherent in this problem but only 3%, the rest should be sought for the reason in the improper installation of the double -glazed window. And it is possible that experienced craftsmen can also make mistakes, but most often the reason is that the inside of the window is very cold or there is a lot of moisture in the room, also fogging can be from a large windowsill that does not allow a good window from the window from the window. Single -chamber double -glazed windows sweat more often than the rest, so take care of proper ventilation and sufficient ventilation, and you should not put many colors on the windowsill, then your windows will be dry and bright.