Advanced engineering and materials make the EcoTherm 280 vinyl new construction window one of the best values on the market today. Built with rugged 100% 1st generation PVC for added protection against air infiltration and a high thermal rating.


| Glazing | U-Value | R-Factor | SHGC | VLT |
|---|---|---|---|---|
| Clear | 0.48 | 2.08 | 0.64 | 0.66 |
| HP Low E | 0.34 | 2.94 | 0.30 | 0.56 |
| Supra Low E Argon | 0.31 | 3.23 | 0.29 | 0.56 |
| ST Stimulus | 0.29 | 3.45 | 0.29 | 0.56 |