Choose the ESP (energy saver package) for performance and savings. The double pane Precision Weld Okna 400 series picture window is maintenance free and a good choice for homeowners in the Northeast. Let the window professionals from Wonder Window help you decide which window is right for you and your budget. Financing available.

  • 10% Better than Energy Star® minimum
  • 3000% Better AI protection
  • A great choice to keep the cold out with excellent thermal efficiency
  • Welded sash & frame for overall durability
  •  Custom made for your home
  • Available in custom exterior colors as well as four standard colors
          Energy Star Comparison To
Glazing Option U-Value SHGC VT CR Minimum* Energy Star Minimum
Dual Glazed              
With ESP 0.27 0.32 0.59 63 0.30 10% 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