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The facts are Krypton is twice the mass of Argon and twice the size. It takes more energy to get the Krypton gas elements moving in a convection between the panes of glass. Therefore more time is needed to transfer the radiant heat from one pane of glass to the next. This time advantage works because it is significant. More than four times as long as Argon. Krypton is better than Argon simply be the chemistry and the physics of the triple glass. I like the use of Xenon as a potential gas for windows. Xenon is over three times the mass of Argon. I would imagine Xenon is more rare than the other two so likely more expensive.


Using Triple pane window glass with 5/16" spacers + 1/8" annealed glass (total thickness of 1 inch) with Low-E3 and Krypton Gas, it is possible to get a R-Value of 12.5 (U-value = 0.08) -- almost the same R-value as your walls (R-13 on new homes).

Using double pane window glass Low-E3 even going to a 1/2" spacer (total thickness of 3/4") via Cardinal Glass with their best glass U-value = 0.25 or R-Value = 4.000, or less than a 1/3 the efficiency of the triple pane krypton window glass.

To get the best argon window glass, you need to go to triple pane (Cardinal XL Edge IG) 1 3/8" (two 1/2 inch spacers with low-3e and argon) for a U-value of 0.11 or R-Value of 9.091 or 72% the efficiency of triple pane krypton window glass. Note it would also be a lot harder to find a window manufacturer with a IGU window spacing 1 3/8" vs 3/4" or 7/8" or 1" in their new construction or replacement window frame.

All widths using annealed (aka double-strength glass that is actually 4 times stronger than single-strength glass).

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