Krypton and argon are two inert gasses commonly used as filler between panes of glass in residential and commercial windows. These gases have advantages and disadvantages consumers should consider when purchasing new or replacement windows.
As air transfers heat quickly, other gases are used between the window panes to improve the window's energy efficiency. Both krypton and argon transfer heat less quickly than air, increasing the insulating value of the window. Krypton has better insulating properties than argon, but is more likely to leak.
Krypton is much more expensive to produce than argon. This makes windows using krypton more expensive. When selecting replacement windows, consumers should consider the expected savings of the higher insulating rating of krypton-filled windows versus the lower initial purchase cost of argon-filled windows.
Window Pane Spacing
Krypton performs best as an insulator when the spacing between the panes of glass is less than half an inch. Argon can be used in windows that have a wider gap between window panes. For this reason, argon is often used for double pane windows while krypton is more often found in triple pane windows.
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