Do krypton-filled windows really make a difference over argon?

Krypton gas does provide better insulation than argon, but the performance difference is modest and comes at a significant cost premium. For most Ottawa homeowners, argon-filled windows offer the best balance of performance and value.

Krypton vs. Argon Performance
Krypton is denser than argon, which makes it a slightly better insulator. In practical terms, a krypton-filled window might achieve a U-factor that's about 0.05-0.10 lower than the same window with argon. For example, an argon window with U-factor 0.25 might achieve U-factor 0.20 with krypton. While this represents better thermal performance, the real-world energy savings in Ottawa's climate typically amount to just $10-30 per window annually.

Where Krypton Makes More Sense
Krypton becomes more beneficial in very narrow glazing cavities (less than 12mm) where argon's larger molecules don't perform as well. It's also used in some ultra-high-performance triple-pane windows where manufacturers are pushing for maximum energy efficiency ratings. However, most quality double and triple-pane windows use optimal cavity spacing that allows argon to perform very effectively.

Cost Considerations in Ottawa Market
The krypton upgrade typically adds $100-200 per window over argon-filled options. Given Ottawa's energy costs and climate, the payback period often extends beyond 15-20 years. Most homeowners achieve excellent energy performance with quality triple-pane, Low-E, argon-filled windows that still qualify for ENERGY STAR certification and Canada Greener Homes Grant rebates.

For maximum energy efficiency in Ottawa's Climate Zone 6, focus first on triple-pane glass, quality Low-E coatings, and proper installation rather than upgrading the gas fill. For a free assessment of which window specifications make the most sense for your home and budget, request a consultation from Ottawa Window Pros.

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