R-5 configuration now available nationwide on Ply Gem Windows products

Ply Gem high performance R-5 windows are highly insulating windows with a whole window  R value of 5 (a U-factor of around .2) These products are the top tier of energy efficient windows.

Energy Star windows have a U-factor of around .3. Reducing the U-factor from .3 to .2 with high performance R-5 windows reduces average heat loss through the window by more then 30% and saves the cons...