Author: Gene Wagstaff (.grey01.tn.comcast.net)
Date:
Saw your note on UFactors vs RFactor and I think you may not be aware that UFactor is the inverse of RFactor ... therefore a UFactor of .20 is equal to an RFactor of 5.0! (1.0 divided by .2) Most Champion windows rate about .30 UFactor equivalent to 3.33 RFactor 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.

