4000 Series Double Hung Windows

  • Smooth and uniform sill
  • Low profile design
  • Expanded glass area

Best-in-Class Performance Features:

  • Reinforced narrow silhouette frame and sash profiles make a statement of style with their low-profile design. The result is a beautiful and expanded glass area. Under the surface, internal chambers increase structural integrity, rigidity and energy efficiency.
  • Composite meeting-rail reinforcement allows for secure mounting of hardware; the non-conductive material helps reduce the transfer of energy.
  • End-of-throw cam shift locking delivers increased strength and protection to the recessed lock. It also includes an “unlocked” indicator.
  • The smooth and uniform true sloped sill quickly directs water runoff without the use of weep holes, keeping the exterior of the window clean and attractive.
  • Our telescoping sill dam delivers a triple payoff: protection from air and water infiltration, increased structural stability and enhanced beauty.
  • When extreme wind and weather hit, our proprietary sill interlock stands strong. Traditional sloped sill designs can allow the sash to bow during powerful winds, but with our interlocking sash-to-sill technology, the sash is channeled firmly into the window frame for a unified wall of strength.
  • Our innovative screen bulb seal creates a snug fit that eliminates light and insect penetration between the screen and frame. It also aids in easy screen installation and removal.

Interior Woodgrains and Exterior Colors.

Interior Grids & Cut Glass

4000 Series Double Hung Windows

Double Hung Windows

4000 Series Technical Specifications

  • End-of-throw cam shift locking
  • Screen bulb innovation
  • Composite meeting-rail reinforcement
  • Telescoping sill
  • Interlocked sill
  • Our SolarZone™ Insulated Glass Package is designed to help you minimize utility costs and ultimately save precious dollars each month.
  • We incorporate a variety of energy-efficient components into our 4000 series, all of which ensure a comfortable living space without breaking the bank. View the details below!

Window Replacement Review by Donna W.

Stopped in to window world on Caton Farm Road. Talked to them about getting windows. He came out the next day and I really liked how he explained everything about the window. Hired them to do my windows. Kept in touch with me to let me know when the windows were in and when they would be installed. 2 guys came to do the job. Very friendly and very considerate about us and keeping the place clean while they did their job. They made no mess and cleaned up after they were done. Very nice place to get windows from and very good people that did the work. Would recommend them to others looking for windows.


SolarZone™ Insulated Glass Package

Thermal Performance Comparison*

Clear Glass Double-Hung

  • U-Value: 0.46 SHGC: 0.59

Clear Glass Sliding

  • U-Value: 0.45 SHGC: 0.59

SolarZone Double-Hung

  • U-Value: 0.29 SHGC: 0.3

SolarZone Sliding

  • U-Value: 0.28 SHGC: 0.3

SolarZone ThermD Elite Double-Hung

  • U-Value: 0.27 SHGC: 0.21

SolarZone ThermD Elite Sliding

  • U-Value: 0.27 SHGC: 0.21

SolarZone ThermD iE Double-Hung

  • U-Value: 0.27 SHGC: 0.3

SolarZone ThermD iE Sliding

  • U-Value: 0.27 SHGC: 0.3
*Whole window values are based on double-strength glass, standard 4000 Series offering with
composite reinforcements. ST and HP performance values are also available.

Air/Water/Structural Results Window World 4000

  • Air/cfm – 0.4
  • Water/psf – 6.0
  • Structural – DP40