But I must say that all of the above advantages are quite important, but they are not the main. The most important thing is the completely incomparable heat that they, in turn, provide. As well as high soundproofing. In any case, you will receive quite high heat savings, as well as a comfortable solitude. It should be noted that modern plastic windows can be opened at any time, which allows you to regularly ventilate the room. In this case, the design of these windows usually provides as many as two ventilation modes – winter and most common. Another rather big plus is that these products are completely environmentally friendly.