Argon gas-filled windows are manufactured from double or triple glass panes whose interface is filled with argon gas, see Figure-1 and Figure-2. The gas is driven into the window through a small hole, and air in the space is forced out through another hole, see Figure-3. These holes can be used as an indicator by which homeowners can recognize argon gas-filled windows.

Argon is denser than air; hence the argon gas-filled window is more energy-efficient than the air-filled double or triple-pane window. Moreover, the thermal conductivity of argon gas is 67% lower than that of air, hence minimizing heat transfer dramatically.

The initial cost of an argon gas-filled window is higher than an air-filled window, but the long-term energy reduction of the former will easily outweigh the latter.

The argon gas does not corrode window materials as oxygen does. As a result, the maintenance and repair costs are reduced. It is important that the argon gas-filled windows are sealed perfectly to prevent the loss of argon gas and avoid a subsequent reduction in the performance of the window.