Conventional Double Glazing involves the creation of a double skin of glass filled with dry air so designed as to increase the energy efficiency of any building in which it is used by reducing the heat losses through the windows. This form of double glazing is far more effective than a single pane window.
Further improvements in the effectiveness of the glazing can be achieved by the choice of glass used in the construction of the panels or by changing the air within the panels for a gas that has a greater degree of thermal performance and cost efficiency. The choice of gases available are Argon, Xenon or Krypton. No, not the same material that rendered Superman powerless.