If I can recommend any picture window replacement this would be the one. The triple pane 500 Series Insul-Tec Deluxe is the top performance ratings of this line. Here is a beautiful, durable and highly energy efficient window that will be the best investment in a high end window. It will stand the test of time guaranteed. 

  • 40% Better than Energy Star┬« minimum
  • 3000% Better AI protection
  • Full 3┬╝" Depth Welded Mainframe 
  • Excellent craftsmanship
  • Vinyl windows are strong and durable 
  • Foam filled frame for greater performance
  • Beautiful, and strong for years of long lasting maintenance free performance.
  • Heatseal┬« warm edge spacer system drastically reduces 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
Triple Glazed              
Deluxe 0.18 0.27 0.44 76 0.30 40% Better
    Industry Comparison To  
  OKNA Windows Minimum Industry Minimum  
AAMA Rating   R75 R15      
Air Infiltration cfm/ft2 <0.01 0.3 3000% Better
Water Penetration mph     66 33   100% Better  
Structural Integrity mph   210 94   123% Better