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 | |
| Triple Glazed | |||||||
| With ESP | 0.21 | 0.26 | 0.43 | 70 | 0.30 | 30% Better | |
| Industry | Comparison To | ||||||
| Our Windows | Minimum | Industry Minimum | |||||
| AAMA Rating | R50 | R15 | |||||
| Air Infiltration cfm/ft2 | 0.02 | 0.3 | 1500% | Better | |||
| Water Penetration mph | 54 | 33 | 64% | Better | |||
| Structural Integrity mph | 171 | 94 | 82% | Better | |||
