R-5 configuration now available nationwide on Ply Gem Windows products
High performance beats Energy StarPly
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...
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