R-Value
Simply put, the higher the R-Value, the better.
According to Wikipedia.org's in depth explanation of r-value's "The R value or R-value is a measure of thermal resistance used in the building and construction industry. Under uniform conditions it is the ratio of the temperature difference across an insulator and the heat flux (heat flow per unit area) through it. The bigger the number, the better the building insulation's effectiveness. R-value is the reciprocal of U-value."
Yes, just like we said; the higher the R-Value of the replacement window, the better.
The average R-Value of a window is between 0.9 and 3.0 with most replacement window manufacturers offering windows up to 3.5. There are window manufacturers that offer replacement window lines with R-Values all the way up to 10!
Keep in mind that U-Factor is the opposite; the lower the number is better for a replacement windows U-Factor and while R-Value rates a windows resistance to heat, U-Factor rates how much heat enters and exits through a window.
The main factors that determine a replacement windows R-Value include
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