Double glazed windows are windows that have two panes of glass separated by a layer of insulating gas or air pocket to better insulate a room. They are also known as double-paned windows or insulating glass units (IGUs) . Double glazed windows are now the standard type of window in most residential building and remodeling. They offer several benefits, including:

• Energy efficiency: Double glazed windows offer better insulation than single-paned windows, reducing the amount of heat escaping in winter and preventing unwanted heat from coming into the home in summer. This added thermal resistance keeps the home at a more comfortable temperature and reduces energy costs.

• Soundproofing: The sealed air gap between the two panes acts as an added layer of insulation, reducing medium to high frequency noise such as the human voice. A difference in glass thickness between the inner and outer panes can further improve sound reduction.

• Increased safety: Double glazed windows are considered a safer option when compared to standard single pane windows. Two sheets of glass are harder to break than one, and for even greater security, toughened or laminated glass can be specified.

When comparing single-paned to double-paned windows, double-paned windows offer better energy efficiency, soundproofing, and overall increased interior comfort. Triple-paned windows are sometimes recommended in environments with harsh weather for maximum insulation.