A “double glazing unit” (Koolpane Glass) refers to a sealed unit made up of two panes of glass separated by a spacer bar, creating an air gap that acts as an insulator designed to reduce heat transfer and improve insulation by creating a barrier against temperature fluctuations, essentially keeping heat inside during cold weather and vice versa. It is good for energy saving, noise reduction, add value to property and improve security as they are generally more robust and harder to break than single glazed windows.