Double-glazed refers to a type of window or door that has two panes of glass with a sealed space between them. There are many synonyms that can be used to describe double-glazed windows, such as thermopane, dual pane, insulating glass, and double-paned. Additionally, terms such as energy-efficient windows, insulated windows, and low-e glass may also be used when referring to double-glazed windows. These synonyms are often used interchangeably and all describe a type of window that is designed to improve insulation and reduce energy consumption by providing a barrier that prevents heat or cold from escaping. Double-glazed windows are often recommended for their ability to improve home comfort, reduce heating and cooling costs, and decrease noise pollution.