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Double Hung Windows

  • Convenient operation and an attractive, traditional style
  • Easy to clean with tilt-out upper and lower sashes
  • Versatile with many size and design options


Double Hung Windows Rockford, Illinois

Window detail openWhen it comes to installing double hung windows in your home, look no further than Window World of Rockford. Whether you are looking to select windows for a new home, or you need to replace your current windows, double hung windows from Window World are a classic option that come in a variety of styles and sizes. All of our double hung windows are built for easy cleaning and maintenance, and are backed by our Limited Lifetime Warranty. Learn more below!


4000 Series Double Hung

WW DH_Sml Med_3D_2X4000 Series windows from Window World are beautiful as well as remarkably solid, sturdy and stable. Our beveled mainframe design is exceptionally slim and refined. Their sleek construction easily complements any type of architecture. You will find that 4000 Series vinyl frames will never chip, peel, crack or warp, and are maintenance free. The 4000 Series tilt-in sashes make cleaning a pleasure due to our effortless tilt latch. The ultimate choice for beauty, comfort and energy efficiency. The 4000 Series windows help to pay for themselves through lower energy costs, freedom from maintenance and increased property value. Our impressive Lifetime Limited Warranty* delivers the peace-of-mind you would expect from an industry leader.

4000 Series Features

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. At the same time, 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.

Additional Sliding Window Features:

  • Sashes glide horizontally for easy opening and closing.
  • Both sashes lift out for convenient cleaning.
  • Nylon-encased dual brass roller system for smooth gliding performance.

Insulated Glass Packages to Meet Your Needs.

Maximize your energy savings by choosing a high-performance SolarZone™ insulated glass† package to meet your specific climate challenges. The lower the U-Value, the less energy you’ll need to heat your home. The lower the Solar Heat Gain Coefficient (SHGC), the more you’ll conserve on air-conditioning.

Thermal Performance Comparison4
Double-Hung Sliding
U-Value SHGC U-Value SHGC
Clear Glass 0.46 0.59 0.45 0.59
SolarZone 0.29 0.30 0.28 0.30
SolarZone ThermD Elite 0.27 0.21 0.27 0.21
SolarZone ThermD iE 0.27 0.30 0.27 0.30
4Whole 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
Air/cfm Water/psf Structural
Window World 4000 0.4 6.0 DP40

6000 Series Double Hung

Home room with double hung windowsThe superior performance of 6000 Series windows starts with innovation. Every precision-engineered component contributes to superior energy savings. The multi-chamber design helps trap dead air to produce an effective insulating barrier, while extra-thick, fusion-welded frames and sashes provide superior structural strength and create a permanent barrier against air and moisture infiltration, adding up to greater energy savings and lower utility bills. 6000 Series windows feature a sloped sill helping to prevent air and water infiltration while maintaining a timeless, detailed appearance. Beveled mainframes on double-hung and sliding windows complement any home style. Best yet, 6000 Series windows are covered by Window World of Rockford’s impressive Lifetime Limited Warranty for complete peace-of-mind.

6000 Series Features

  • Quad 4 weatherstripping at the header
  • Triple-barrier weatherstripping between sash and jamb
  • Compression bulb seal at the sill for further weather protection
  • Hidden screen track produces clean lines
  • Fully extruded lift rails for strength & durability
  • Fusion-welded sash & mainframe adds strength and rigidity

Double Hung 6000 Window Technical Details

  1. Vinyl frames and sashes will never chip, peel, crack or warp, tough and solid with virgin vinyl with color is formulated throughout so the beautiful luster lasts.
  2. Airtight insulating chambers help reduce conduction and cut high energy bills.4000 Series Double Hung Window
  3. Quad 4 weatherstripping at the header adds even more protection from the elements.
  4. Insulated glass unit with optimal air space improves year-round performance.
  5. PPG Interlock™ Warm Edge Spacer System maximizes window performance and Longevity.
  6. Interlock at sash meeting rails create a super-tight seal against air infiltration,providing security, comfort and well-being.
  7. Metal reinforcement adds strength at the meeting rails.
  8. Drop-in glazing provides energy efficiency as well as interior aesthetic appeal.
  9. Compression bulb seal at the sill creates an all-season weather barrier.
  10. Sloped sill ensures quick water to drainage to the exterior.
  11. Hidden Screen track produces clean lines and added beauty.

Additional Features

  • A fusion-welded sash and mainframe structure for added strength and rigidity. Tough, extra-thick extrusion walls provide the ultimate in welding strength.
  • Dual ventilator locks a secure way to keep windows open for proper ventilation.
  • Full balance covers help protect against air infiltration while adding a finished look to the window frame.
  • Constant force balance system eliminates sash cords, weights and pulleys,and provides easy fingertip operation.
  • Tilt-in top and bottom sashes make cleaning safe and easy from inside the home.
  • Triple-barrier weatherstripping between the sash and jamb for superior protection from air and water infiltration.
  • Full or half fiberglass screens provide ventilation while keeping insects out.

Think double-hung windows could be right for your Rockford home? Contact us today for your free home estimate!

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