Insulating glass (double glass) units, or IGUs, are designed to keep homes cooler in warm climates. An insulating glass unit commonly consists of two or more panes of glass separated by a spacer material and sealed together at the edge. The insulating airspace is filled with air such as vacuum argon gas filled inside.
Using argon in the air space between the two panes of glass provides further insulation, as the gas is denser than air and less likely to let heat conduct through the IGU (Insulated Glass Unit). These gases work to improve the window’s overall u-value, which is a measure of the heat transmission through a building part (such as a wall or window). The lower the u-value, the better the insulating glass unit.