Double glazed windows insulate against temperature and sound.
An unique and elegant solution to double glazing existing windows are systems such as;
With these systems a thin strip of magnets is attached around the window frame. Then a transparent acrylic panel is attached to create the double glazing effect. The sheet can be removed easily if required, for example to open the window.
An added benefit of using acrylic is that it has better thermal insulation properties than glass.