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Argon vs Krypton — Which Gas Fill?
Argon, krypton, xenon — what's the difference between sealed unit gas fills, and when is the premium for krypton actually worth it?
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Argon vs Krypton — Real-World Difference
Air is our standard fill. Argon is the popular upgrade; krypton is the premium option. Here’s when the upgrade actually pays back.
Why fill with gas at all?
Gases like argon and krypton conduct heat far less than air. Filling the cavity in a sealed unit reduces heat loss by 5–10%.
Argon density
1.78 kg/m³
Krypton density
3.74 kg/m³
Argon thermal conductivity
0.017 W/mK
Krypton thermal conductivity
0.009 W/mK
When to choose krypton
- Heritage frames with restricted cavity depth (8–12mm)
- Triple glazed units where overall thickness must stay under 36mm
- Passivhaus or low-energy targets where 0.5 W/m²K matters
When argon is fine
For any standard 16–20mm cavity, argon delivers 90%+ of krypton’s benefit at a fraction of the cost.