3 to 3.8 Double-pane windows have an R-value ranging from 3 to 3.8, while triple-paned windows have an R-value of up to 7- 8, making them more effective at blocking heat flow. This means that replacing double-paned units with triple-paned windows reduces heating costs.
Double-paned windows have an R-value ranging from 3 to 3.7, according to the Arizona Public Service Co., while triple-paned windows have an R-value of up to 5, making them more effective at blocking heat flow.
The U value of a double pane window is a measure of its insulation ability. It represents the rate of heat transfer through the window, with lower U values indicating better insulation. How much heat is lost through a single pane aluminum frame window?

Double-pane windows have an R-value of 22.5, whereas triple-pane windows have 34.Triple-paned windows have a 0.30 BTU/hr/sfF insulative value, compared to 0.22 for double-paned windows.
Double-paned windows are worth the investment for the privacy you get. They not just enhance the comfort of your home and lower your energy bills, but they can also appreciate your homes market value.

Anyone that talks about r values when talking about windows is blowing smoke, unless they are giving the REAL r-value of the total system, which, if the u-value is .25 would be R-4.