The next in line in terms of quality assessment are double -glazed windows. To evaluate how well the windows will protect you from cold and noise, you need to find out how many cameras include a double -glazed window. It is better if two cameras are present in the windows, and the distance between the glasses and their thickness differs among themselves. External glass should be thicker, and the distance between the glasses inside the outer chamber should be slightly larger than between the glasses of the internal chamber. This aspect must be clarified by the manufacturer, because it affects the quality of windows and comfort, which will easily be achieved with high -quality windows.