The changes also highlight the need for efficient retro-fit methods to improve insulation in existing homes. It is now common practice to retro-fit insulation into ceilings, floors and walls, however, a lot of homes still have only single glazed windows, allowing a lot of heat to escape through the windows.

Metro GlassTech has methods to retro-fit double glazing into almost any existing window frame, which can half the heat loss through the windows. When combined with Low E and Argon Gas, the heat loss reduction can be as high as 73%.