Our 400 series double hug with the energy save pack has been very popular. 

  • 13% Better than Energy Star┬« minimum
  • Same great sash and welded frame
  • ESP is our Energy Saving Package 
  • Lower condensation Heatseal┬« warm edge
  • Beautiful, durable and energy efficient.


          Energy Star Comparison To
Glazing Option U-Value SHGC VT CR Minimum* Energy Star Minimum
Dual Glazed              
With ESP 0.28 0.30 0.54 62 0.30   7% 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  
Water Penetration mph - Specifies wind load pressure in mph a window can withstand  
without leaking, under rain equivalent to 8" per hour.        
Structural Integrity mph - Wind load in mph a window can withstand before breaking.