The Okna 500 Series ESP double hung energy savings package with triple pane glass is a very popular choice.
- 30% Better than Energy Star® minimum
- 1500% Better AI rating than Industry Standard!! (Significantly lower Air Infiltration)
- 3¼" Deep welded frame curved colonial exterior a beautiful, strong long lasting performance.
- Heatseal® warm edge spacer drastically reduces the possibility of condensation on the inside of the window.
- Full integral interlock with double weather-stripping.
- Chooses the Auto-Lock feature for security.
- Matching colors on our fully extruded handles.
- Factor installed fiberglass mesh half screens.
- Optional locking screen for added security.
- Perfect double hung for new Construction or as a replacement window.
- All Okna windows are custom made for a great fit and look.
|Energy Star||Comparison To|
|Glazing Option||U-Value||SHGC||VT||CR||Minimum*||Energy Star Minimum|
|With ESP||0.21||0.26||0.43||70||0.30||30% Better|
|Our Windows||Minimum||Industry Minimum|
|Air Infiltration cfm/ft2||0.02||0.3||1500%||Better|
|Water Penetration mph||54||33||64%||Better|
|Structural Integrity mph||171||94||82%||Better|