ESP = Energy Saver Package double pane version of the Enviro-Star 800 Series sliding window is a serious option to consider. It has a heavy duty foam filled frame for maintenance free durability and beauty. We make it easy with our no hassle sales approach. Let Wonder Windows educate you on the difference between our windows and any other manufacture.
- 7% Better U-Value than Energy Star® minimum
- 600% Better Air Infiltration protection
- Wide selection of hardware options
- Superior craftsmanship
- Full integral interlock with double weather-stripping.
- Full 3¼" Depth Welded Mainframe
- Beveled colonial exterior features
- Available in standard and custom exterior colors
- Maintenance free, for years of long lasting performance.
- Heatseal® warm edge spacer system for excellent thermal efficiency and drastic reduction in the possibility of condensation on the inside of the window.
- Available in Replacement and New Construction applications.
| Energy Star | Comparison To | ||||||
| Glazing Option | U-Value | SHGC | VT | CR | Minimum* | Energy Star Minimum | |
| Dual Glazed | |||||||
| With ESP | 0.28 | 0.28 | 0.52 | 63 | 0.30 | 7% Better | |
| Industry | Comparison To | ||||||
| Our Windows | Minimum | Industry Minimum | |||||
| AAMA Rating | R 50 | R 15 | |||||
| Air Infiltration cfm/ft2 | 0.05 | 0.3 | 600% | Better | |||
| Water Penetration mph | 62 | 33 | 88% | Better | |||
| Structural Integrity mph | 171 | 94 | 82% | Better |
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