Do you happen to have the values handy, or are you just repeating sales
pitch?


The thermal conductivity (k) of air is 0.024, and argon is 0.016. Window
manufacturers must provide performance results of certified tests on all
windows. If you go though a catalog from a manufacturer and compare the heat
loss for windows that are identical except for the argon fill and LowE, you
will see quite a difference between the two products. These are tests of the
entire window assembly, not just a calculation.

Dennis