Author: Gene Wagstaff (---.grey01.tn.comcast.net)
Date:
Saw your note on U-Factors vs R-Factor and I think you may not be aware that U-Factor is the inverse of R-Factor ... therefore a U-Factor of .20 is equal to an R-Factor of 5.0! (1.0 divided by .2) Most Champion windows rate about .30 U-Factor equivalent to 3.33 R-Factor with double pane, low E, and argon gas with a 5/8" space between glass. Some of the triple pane, etc do better at a much higher cost! So while no glass window is anywhere close to an R18 wall there is a big difference in an R1 single pane glass and an R3.33 Champion Window or an R5.0 high performance window since R scale is a direct linear value.
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