Okna's Insul-Tec 500 double pane Deluxe double hung window is a winner. You'll love the design features and durability. Remember all Okna windows come with a limited lifetime guarantee. Compared to other high end manufactures you'll fine the 500 series to be one of the very best values.

  • 17% Better than Energy Star┬« minimum
  • 1500% Better Air Infiltration protection than industry standards.
  • 3┬╝" Deep welded frame curved colonial exterior a beautiful, strong long lasting performance.
  • Heatseal┬« warm edge spacer drastically reduces the possibility of condensation on the inside of the window.
  • Full integral interlock with double weather-stripping. 
  • Chooses the Auto-Lock feature for security.
  • Matching colors on our fully extruded handles. 
  • Factor installed fiberglass mesh half screens.
  • 4 exterior color options
          Energy Star Comparison To
Glazing Option U-Value SHGC VT CR Minimum* Energy Star Minimum
Dual Glazed              
Deluxe 0.25 0.30 0.55 62 0.30 17% Better


      Industry Comparison To  
  Our Windows Minimum Industry Minimum  
AAMA Rating R50 R15      
Air Infiltration cfm/ft2 0.02 0.3        1500% Better
Water Penetration mph   54 33           64% Better  
Structural Integrity mph 171 94           82% Better