The performance of the entire window is primarily affected by the quality of the double -glazed window. They ate superficially to compare them, then identifying special differences is very difficult. But in fact, in the process of use, not all double -glazed windows retain their initial properties: maintaining heat in the room, lack of condensation at temperature surges, and so on. And there are several reasons for that. First of all, double -glazed windows made using an aluminum connective strip are not able to save energy. Aluminum perfectly conducts heat and cold, so this connecting strip plays the role of a heat conductor in summer and cold in winter.
