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Why Some Windows Are Filled With Argon Gas

Windows have come a long way from being simple holes in the wall. Technology has equipped manufacturers with different ways to make windows more beautiful, longer lasting and more energy-efficient.

One of the most effective ways to make custom windows more energy-efficient is the use of inert gases between two adjacent, sealed glass panes. A common choice is argon gas.

Why Gas Fillers Are Used in Windows

These types of windows are called thermal windows or insulated gas units (IGUs). Many have dual-pane glass, but there are also triple-pane units. These windows are installed to improve the home’s energy efficiency. Argon gas is injected into the space between panes of glass to reduce or slow down heat transfer.

Unlike air, argon and other similar gas fills don’t cause condensation. Air contains moisture, which can cause the window to appear cloudy. Argon gas is odorless, colorless and non-toxic

What Makes Argon Gas-Filled Windows Better?

Units with argon gas fill are better than single-pane windows because they are more energy-efficient. They don’t allow heat from the outside to transfer indoors easily. The U-value of an argon gas-filled window is much lower than that of a non-filled or air-filled window, which means it performs better in preventing thermal bridging or heat transfer.

Compared to oxygen, argon does not result in corrosion in the window frame. It helps reduce the outdoor sounds that enter your home. Combine it with Low-E glass, and you’ll surely notice the difference. You can use argon gas-filled windows in any climate.


You can enjoy the benefits of argon gas in your windows, but you should know that the gas fill doesn’t last forever. All windows with fillers leak at some point. Argon is known to leak at a rate of up to 1% per year in the best conditions. It doesn’t expand or contract with the window glass or frame so the seals may eventually break. When the gas in your windows has leaked out, you might notice condensation between panes. When this happens, have your window repaired as soon as possible.

Want to enjoy the benefits of argon gas-filled, energy-efficient windows? At Renewal by Andersen® of Amarillo, we can help you with beautiful and energy-efficient replacement windows. Call us today at (512) 270-6611, or contact us here for a consultation.


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