An amazing triple pane picture window with the total performance you deserve. The Okna Enviro-Star with the ESP (energy saver package) is on very popular window. Compare this to any high end window manufactured today and see why more and more homeowners choose Okna for the total value at lower prices. Let the experts at Wonder Windows show you the difference.
  • 33% Better than Energy Star┬« minimum
  • 3000% Better Air Infiltration protection
  • Wide selection of glass, grids and shapes and sizes
  • Superior craftsmanship
  • Full 3┬╝" 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
  • Lower 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
Triple Glazed              
With ESP 0.20 0.27 0.44 70 0.30 33% Better


      Industry Comparison To  
  Our Windows Minimum Industry Minimum  
AAMA Rating R 75 R 15      
Air Infiltration cfm/ft2 0.01   0.3  3000% Better
Water Penetration mph   66   33  100% Better  
Structural Integrity mph 210   94  123% Better