Why PVC (plastic) windows fog up

As is known, PVC windows are not inferior in quality to wooden windows and in many respects even surpass them. They also have one not very pleasant common trait — the formation of condensation. For some people this may not be a problem, more precisely, if you look at its aesthetic aspect one can live with it, but, alas, condensation cannot be considered a problem only of that nature. Condensation tends to moisten building structures, which in turn exposes your windows to the development of fungus and mold. And that already becomes an unpleasant problem. I think the main question is one: how can this problem be dealt with and what are the causes of the "dew" on your double-glazed units?

A first, rather useful fact for owners of metal-plastic windows is that the temperature in a room where plastic windows are installed should not drop below +18 degrees Celsius. So in that situation you must definitely address the room's heating, otherwise condensation will form on the windows. There are many causes of condensation, ranging from household reasons to manufacturer fault. Now about all the details in more detail.
1. If you very often dry clothes on the radiators, don't be surprised when you find condensation on the windows. A quite understandable household cause that can be easily avoided.
2. The presence of cold surfaces in the room is another reason.
3. The use by the manufacturer of low-quality sealants and gaskets, and improperly made drainage holes.
4. Be sure to pay attention to the correct installation of the window — don't choose an excessively large windowsill; you need to properly foam the seams so as not to reduce the thermal resistance.
5. In premises where repair work is carried out, humidity tends to persist for up to two years, and as mentioned above, humidity is a cause of condensation.

And finally, let's explain how to "deal with" fogged-up windows.
You need to insulate your room as well as possible, namely the exterior wall. If there are any defects in the ventilation, they must be fixed. The easiest and simplest way to get rid of condensation is to ventilate the room as often as possible, and even more frequently during repair work. And, of course, try to eliminate sources of dampness where possible.

And most importantly, it's better not to face this problem at all, and to do that you should simply choose higher-quality double-glazed units.