The number of cameras is very important, it can vary from one to six. The more there are, the more, respectively, it will be warmer in the room, but double -glazed windows with a large number of cameras are more expensive. When solving this issue, take into account, first of all, the climatic conditions in your area. A single-chamber double-glazed window is standard, it consists of two glasses, its width is a little more than 3 centimeters, such double-glazed windows are usually used in rooms that go to the loggias, as well as in those rooms for which heat and sound-distinction are not the most important characteristics.