What are the differences of Argon, Krypton, and Xenon in IGUs?

Choosing the correct gas fill type for insulating glass is important to enhance the energy efficiency of windows. The main gases used for this purpose are Argon and Krypton in IGUs but also xenon can be used. Here is a brief comparison of these gas types use:   


  • Affordability: Argon is the most popular and cost-effective option, making it a practical choice for many homeowners.
  • Reasonable Performance: While not the densest gas, argon still provides reasonable energy performance, contributing to improved insulation.


  • Superior Performance: Krypton boasts superior energy performance, potentially reducing energy expenses significantly. However, Krypton costs more compared to argon.
  • Narrow Profile Use: Commonly used in triple-pane windows, especially those with a narrow profile.


  • Top Performance: Xenon represents cutting-edge energy performance, lowering a window’s thermal U-value below those insulated with argon or krypton.
  • High-Performance Solutions: Suitable for those aiming for top-tier energy efficiency, such as in LEED-certified buildings. Therefore, also the cost is high.

In conclusion, Argon and Krypton in IGUs are the most common but the choice between all three gases, argon, krypton, or xenon, for insulating glass depends on various factors such as budget, desired energy performance, and specific project goals. Evaluating the long-term benefits and considering local building regulations will aid in making a well-informed decision for optimal energy efficiency in windows.