Okna's Insul-Tec 500 double pane Deluxe double hung window is a winner. You'll love the design features and durability. Remember all Okna windows come with a limited lifetime guarantee. Compared to other high end manufactures you'll fine the 500 series to be one of the very best values.
- 17% Better than Energy Star® minimum
- 1500% Better Air Infiltration protection than industry standards.
- 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.
- 4 exterior color options
| Energy Star | Comparison To | ||||||
| Glazing Option | U-Value | SHGC | VT | CR | Minimum* | Energy Star Minimum | |
| Dual Glazed | |||||||
| Deluxe | 0.25 | 0.30 | 0.55 | 62 | 0.30 | 17% 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 | |||
