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Originally Posted by island911

There ya go...

Here is a great article on it all.

Understanding Energy-Efficient Windows - FineHomeBuilding

Apparently, when the windows leak the argon, not much changes.

that statement is specifically about conduction/convection in the article. It doesnt say anything about radiation blocking properties of argon which was the original supposition. It does give a great explanation of how radiation is blocked/transmitted by (low e) coatings