Most homeowners know insulated windows use gas between the panes, but few realize there are actually three common insulating gas window fills, argon, krypton, and xenon, each with different performance and cost trade-offs. Our energy-efficient window solutions feature all three gas fill options.
Why Windows Use Insulating Gas Fills
Air alone conducts heat better than a truly insulating gas, so double and triple-pane windows are filled with a denser, slower-moving gas between the panes to reduce heat transfer beyond what an air gap alone would achieve. The specific gas used, and how tightly the panes are sealed, both affect how well a window performs in extreme heat or cold.
Argon: The Standard Choice
Argon is the most common insulating gas fill, and for good reason: it’s widely available, relatively inexpensive, and provides a meaningful efficiency improvement over a plain air-filled window. It’s the standard choice across most mid-range double-pane and triple-pane window products, and it performs well across the wide seasonal swings Salt Lake City sees throughout the year. Our full lineup of replacement windows includes argon fill as a standard option.
Krypton: Better Performance in a Thinner Space
Krypton is denser than argon, giving it better insulating properties, but it costs significantly more to produce. Because of its density, krypton performs particularly well in narrower gaps between panes, making it a common choice for windows where space between the glass layers is more limited, such as in some triple-pane configurations where three panes of glass need to fit within a similar overall frame thickness.
Xenon: Maximum Insulation for Premium Windows
Xenon is the densest and most expensive of the three gases, offering the best insulating performance but at a cost that puts it firmly in premium window territory. It’s not common in standard residential window products, but it shows up in some high-end triple-pane windows built for maximum energy performance, sometimes blended with krypton rather than used alone. For most homeowners, the jump in cost from krypton to xenon doesn’t deliver a proportional jump in real-world savings, but it’s worth knowing the option exists if you’re pursuing maximum efficiency regardless of cost.
Which Gas Fill Is Right for Your Windows?
Choosing the right insulating gas window fills for your project comes down to budget and performance goals and price. Krypton is worth considering for triple-pane windows or tighter frame configurations, and xenon is really only relevant if you’re building toward the absolute highest efficiency regardless of cost. Our Double Pane vs. Triple Pane Windows guide covers the broader pane-count decision, and our Window Energy Ratings Explained guide covers how to compare the resulting performance numbers directly.
Curious which insulating gas fill fits your window project? Schedule a free consultation with our Salt Lake City team for a free quote. You can also check out our business profile and reviews from other Salt Lake City homeowners.