The ESP (energy saver package) double hug 400 double hung means what it says. For homeowners who need a beautiful and energy efficient replacement this is a very good choice.
- 27% Better than Energy Star® minimum
- Fully welded welded beveled frame and sash that is very durable
- One of the top windows in the 400 series for energy efficiency
- Heatseal® warm edge means lower condensation on the window.
|Energy Star||Comparison To|
|Glazing Option||U-Value||SHGC||VT||CR||Minimum*||Energy Star Minimum|
|With ESP||0.22||0.26||0.43||68||0.30||27% Better|
|Our Windows||Minimum||Industry Minimum|
|AAMA Rating (38 x 63)||R50||R15|
|Air Infiltration cfm/ft2||0.05||0.3||600%||Better|
|Water Penetration mph||56||33||70%||Better|
|Structural Integrity mph||171||94||82%||Better|