But let’s discuss the shortcomings. They are also present. As a rule, a double -glazed window has a thickness of 32 millimeters, despite the fact that a single one is 24 millimeters. The difference is about one and a half times. As a rule, this does not cause problems if you do not take into account cases when the window is installed in the opening with a thin wall. In addition, the weight of the wings at such a window is one and a half times higher, which is also a significant drawback, because it causes a greater wear of the mechanism where the wings are attached. Due to the fact that it mainly goes through heat radiation, the best alternative option in the past few years is the use of infrared glasses, which have a special spraying, which reflects thermal radiation back into the room.