Improving the beauty and value of your home comes naturally to Comfortworld 4000 Windows from Window World. Not only are these windows beautiful–they're remarkably solid, sturdy and stable. Plus, our beveled master frame and sash design is exceptionally slim and refined, so your home shines in a whole new light–inside and out.

You'll enjoy a new level of maintenance freedom with Comfortworld 4000 Windows. They feature vinyl frames that will never chip, peel, crack or warp–never need painting or caulking. And Comfortworld 4000's tilt-in sashes make cleaning a pleasure. You'll save money on energy bills because Comfortworld 4000's superior all-weather performance helps reduce heating and cooling costs.

The ultimate choice for beauty, comfort and energy efficiency, Comfortworld 4000 Windows will pay for themselves through lower energy costs, freedom from maintenance and increased property values. And all Comfortworld 4000 Windows are covered by our impressive Lifetime Limited Warranty.*

Superior strength is fusion-welded into every Comfortworld 4000 window

1. BEVELED EXTERIOR MASTER FRAME for a clean, elegant look.
   
   
2. MULTIPLE INSULATING AIR CHAMBERS help to reduce conduction and increase energy efficiency.
   
   
3. FULLY EXTRUDED LIFT RAIL for strength and durability.
   
   
4. MEETING RAIL INTERLOCK gives protection from the weather as well as added security.
   
   
5. METAL REINFORCEMENT for added strength at the meeting rails.
   
   
6. SLOPED SILL forces water to drain to the exterior.
   
   
7. DOUBLE BARRIER-FIN WEATHERSTRIPPING around sashes and frame helps to protect against the elements.
   
   
8. INSULATED GLASS UNIT with PPG INTERCEPT™ WARM EDGE SPACER SYSTEM improves the window's year-round performance.
   
   
9. HIDDEN SCREEN TRACK for added beauty.
   
   

Other features include :

• FUSION-WELDED SASH AND MASTER FRAME for added strength.
  
  
• TILT-IN SASHES for ease of cleaning.
  
  
• FULL BALANCE covers help protect against air infiltration and add a finished look to the window interior.
  
  
• CONSTANT FORCE BALANCES eliminate sash cords, weights and pulleys, and make opening and closing the window easier.
  
  
• Protective HOLLOW BULB SEAL at the sill acts as a secondary weatherstripping.
  
  
• COLOR-COORDINATED TILT LATCHES, LOCK AND KEEPER for a clean, consistent appearance.
  
  
• Color-coordinated DUAL VENT LOCKS limit the movement of the sashes from the interior and exterior while allowing for ventilation.