The Okna double hug 400 series Deluxe is an excellent entry level replacement window. As a Buffalo homeowner you appreciate just how cold it can get so an investment in energy saving windows like this one can help lower those utility bills. 

  • 33% Better than Energy Star┬« minimum
  • Fully welded sash and welded frame
  • Excellent energy efficiency 
  • Heatseal┬« warm edge for lower condensation 
  • A durable and energy efficient double hung window.
  • The highest performance rating of the 400 series options.
Glazing Option U-Value SHGC VT CR Minimum* Energy Star Minimum
Triple Glazed              
Deluxe 0.20 0.26 0.42 72 0.30 33% Better


      Industry Comparison To  
            Our Windows Minimum Industry Minimum  
AAMA Rating (38 x 63)   R50 R15      
Air Infiltration cfm/ft2   0.05 0.3  600% Better
Water Penetration mph   56 33   70% Better  
Structural Integrity mph   171 94   82% Better