PCV
PVC is a plastic, which is most often used to produce windows in Poland and Europe. The new generation of PVC windows allows to reach high energy savings due to effective thermal insulation. In other words, they give big savings on heating, because they do not allow uncontrollable heat loss.
At the same time, they are not expensive windows, which, combined with their quality and insulation effectiveness, make them take high positions in sales rankings. They have the best price-to-benefit ratio they offer.