For what reason the windows are fogging? You have asked such a question more than once? I am a specialist in the installation of metal -plastic windows, because of this they often ask me such a question. The window can fog for various reasons: the first reason is sometimes a poorly selected double -glazed window. Heat guns may be required. Another prerequisite for fogging may be a mistake of specialists who were incorrectly installed in the wall. If, for example, mount the window outward to the maximum, then such installation will be the reason for their fogging. The moments above are set out to take into account in design companies, because they are not just paid money. Also, another of the reasons is poor natural convection. So that you can understand and do not have additional questions, I will give a way: there is a room with a window block, mainly under the window they install a battery. But there are times when the window is two meters long. In this case, the heating radiator is not installed in the middle under the double -glazed window, but with a displacement from the middle. Let’s assume that the heating radiator will be covered with a windowsill. In addition, the reason may be high humidity. If fogging of windows is formed due to high humidity, the room needs to be ventilated. In this case, fogging will stop disturbing you. You can also use the detergent, its composition does not allow the window to fog.