The EcoShield 400 new construction double hung unites elegance and performance in a single, highly-efficient system. Engineered for strength and durability, with high-end features typically found only in the most expensive premium lines, the 400 series vinyl window delivers superior value.

| Glazing | U-Value | SHGC | VLT |
|---|---|---|---|
| DOE - R5 - Triple | 0.21 | 0.21 | 0.39 |
| ST Energy Star | 0.29 | 0.26 | 0.49 |
| HP Low E | 0.34 | 0.26 | 0.49 |
| Clear | 0.45 | 0.56 | 0.58 |
Not sure what the difference is between a double hung window and a single hung window? Check our frequently asked questions page for answers to common window questions. View or print installation instructions for new construction double hung windows.