Doublepan

Doublepan refers to a type of window construction that features two panes of glass separated by a sealed air or gas-filled space. This design is commonly used in modern windows and is also known as double glazing or an insulating glass unit (IGU). The primary purpose of doublepan windows is to improve thermal insulation. The gap between the two panes acts as a barrier, reducing heat transfer between the interior and exterior of a building. This helps to keep homes warmer in winter by preventing heat loss and cooler in summer by reducing heat gain.

The effectiveness of a doublepan window is often measured by its U-value, which indicates the rate of heat transfer. Lower U-values signify better insulation. The air or gas within the sealed space can be ordinary air, or it can be filled with inert gases like argon or krypton, which are denser and less conductive than air, further enhancing the insulating properties. The edges of the panes are typically sealed with a spacer bar, which can be made of metal or a warmer, composite material, and often contains desiccants to absorb any moisture within the sealed unit. This prevents condensation from forming between the panes. Doublepan windows are a standard feature in energy-efficient building designs.