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Using an inert gas (usually argon) to fill the airspace between panes of glass can increase the energy efficiency of window units due to the low conductivity of the gas. Gas-filled units benefit from reduced conductive and convective heat transfer.

Why make insulated glass units which are gas filled?

Reduced heat loss

The lower conductivity of inert gases such as argon increase the energy efficiency of a window by reducing heat loss through the sealed unit.

Cost effective

way to improve energy performance of windows and buildings.

Reduce condensation

By reducing heat loss and keeping the inner glass pane warmer, windows that are gas filled are much less likely to develop condensation. Less condensation will lower the chance of potentially harmful mould and bacteria growth that could trigger health problems such as asthma and dermatitis.

In the UK, if manufacturers opt to gas fill they must prove compliance to EN-1279 part 3 standards. This requires the manufacturer to produce units to this standard to pass a test to prove that their glazing unit construction does not leak gases in and out. It also requires manufacturers to monitor their unit gas fill to ensure a fill rate of at least 90%.