Doule glazed windows with double glass and double seals matched with pvc profiles ,upvc extrusions profiles.The benefits of double glazing----Double glazed windows are an ideal energy efficient choice with the added benefit of minimising noise. The sealed air gap between the two panes acts as an added layer of insulation. This added thermal resistance reduces the amount of heat escaping in winter and keeps your home at a more comfortable temperature. Double glazing has the reverse effect in summer, preventing unwanted heat from coming into the home. This extra insulation lessens your reliance on artificial heaters and air conditioners and can ultimately reduce your energy costs.Double glazed windows are considered a safer option when compared to standard single pane windows.