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An Insulating glass unit is the most effective way to reduce air-to-air thermal transfer through the glazing. When used in conjunction with low emissivity andor reflective glass coatings, IGU's become effective means to conserve energy. An insulating glass unit commonly consists of two (sometimes more) panes of glass separated by a spacer material and sealed together at the edge. The insulating airspace is filled with air or a noble gas, such as argon inside. Each glass pane has two surfaces, so typical double-paned IGUs have four surfaces. Using argon in the air space between the two panes of glass provides further insulation, as these gases are denser than air and less likely to let heat conduct through the IGU. Combined with a low-e glass coating, 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.