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WeatherLok® Windows

weatherlok-windows-logoWeatherLok  provides premium vinyl replacement windows, offering homeowners energy efficiency, durability, and an expansive array of optional features available. Atrium Windows, the manufacturer for WeatherLok was ranked in the Top 25 Window Manufacturers in the USA. We guarantee that you will be pleased with your new replacement windows from WeatherLok.

Double Hung Windows

Harris Exteriors offers the 3201, 3500, and the 3900 series of WeatherLok double hung windows. Every WeatherLok window goes through a rigorous process of quality control to be certain it meets and exceeds the standards. Click on each tab for the 3 different series of double hung windows to view information, features, and custom options. If you have any questions about any of the WeatherLok® Windows you see, please call 630-883-5367  for more information, or a free estimate!

  • WeatherLok-3201-Double-Hung-Windows

    Series 3201 Double Hung Windows

    The 3201 double hung windows offers unrivaled quality featuring superior strength, longevity, tough durability, and eye catching beauty. The loss of indoor air is minimized by interlocking sashes on the window.

    • All-welded sash and frame corners
    • Reinforced multi-cavity construction offers additional thermal protection and structural integrity
    • Constant force coil balance permits easy sash movement
    • Integrated full-length slim line lift rail
    • Positive-action deluxe cam lock for optimal security (2 locks standard at 27-1/4" or wider)
    • Half screen comes standard
    • Heavy duty, spring-loaded night latches
    • Dual-fin weather stripping and rubber bulb seal block air infiltration
    • Sloped sill allows for easy water run-off
    • Both sashes operate and tilt in
    • Beveled exterior for attractive appearance
    • Insulated glass panels with optimum thermal air space featuring warm-edge spacer system
    • Sash latches for optimum ventilation
    • Available colors: white
    • Jamb depth: 3.25"
    • Transferable limited lifetime warranty
    • Ultra Low-E/Argon Glass (may be required for Energy Star rating)
    • Low-E/Argon Glass
    • Low-E Glass
    • Obscure and double-strength glass
    • Optional 5/8" or 1" contoured, or 5/8" or 3/4" flat or diamond grid
    • Aluminum charcoal mesh screen
    • Lifetime glass

  • WeatherLok Series 3500 Double Hung Window

    Series 3500 Double Hung Windows

    WeatherLok's solid vinyl 3500 double hung offers all the advantages of our other double hung series, plus a welded vinyl frame and sashes for unmatched strength and flawless beauty.The frame and sash provide a classic beveled edge that will be sure to enhance your home decor.

    • Aluminum-reinforced multi-cavity construction
    • Fusion-welded frame and sash corners
    • DP 35 rating (DP 50 optional, window size tested 36" x 74")
    • Integrated full-length, slim line lift rails
    • Dual-fin weather stripping and rubber bulb seal block air infiltration
    • Sloped sill allows for easy water run-off
    • Positive-action deluxe cam lock for optimal security (2 locks standard at 27-1/4" or wider)
    • Heavy duty, spring-loaded night latches
    • Rounded sashes for an elegant interior appearance
    • Half screen standard
    • Both sashes operate and tilt in
    • Available colors: white, almond; bronze exterior finish on white
    • Insulated glass panels with warm-edge spacer system for outstanding thermal performance and condensation resistance
    • Constant force coil balance for easy sash movement
    • Jamb depth: 3.25"
    • Transferable limited lifetime warranty
    • 25-year glass breakage warranty – standard
    • Ultra Low-E/Argon Glass (may be required for Energy Star rating)
    • Low-E Glass
    • Obscure and double-strength glass
    • Optional 5/8" or 1" contoured, or 5/8" or 3/4" flat or diamond grid
    • Decorative glass
    • Brass or brushed nickel locks
    • Aluminum charcoal mesh screen
    • Lifetime glass breakage warranty

  • WeatherLok Series 3900 Double Hung Windows

    Series 3900 Double Hung Windows

    Top-of-the-line design, great energy efficiency and a wide range of premium enhancements as standard features make the Series 3900 one of WeatherLok's very best window. With a variety of options for cosmetic, thermal and functional upgrades, the 3900 offers unmatched stability and thermal performance as well as lasting, classic design.

    • Exclusive InsulKor™ polyurethane fiberglass-enriched sash reinforcement for superior thermal and structural performance
    • 3/4" constant force coil balance offers incredibly easy sash mobility
    • Fusion-welded sashes and frame add strength and boost insulation
    • Low-E glass with insulating argon gas yields outstanding thermal efficiency
    • DP 60 rating (window size tested 36" x 74")
    • Beveled mainframe offers a stylish exterior appearance
    • Dual push-button night latches position sashes for optimal ventilation
    • External accessory groove accommodates nail fin option
    • Integrated, slim line lift rail allows you to easily operate sash
    • 4-1/4" frame thickness enhances appearance as well as structural integrity
    • Full screen with strong extruded aluminum frame
    • Dual low profile, positive-action cam locks increase security (2 locks standard at 27-1/4" width or wider)
    • Full interlocking lock and meeting rail
    • Full vinyl sash dam on sill and high-performance weather stripping protect against air infiltration
    • 3.25" jamb depth for ideal window sizing
    • Transferable limited lifetime warranty
    • Lifetime glass breakage warranty
    • Ultra Low-E/Argon Glass (may be required for Energy Star rating)
    • Low-E Glass
    • Triple-pane, R-5 compliant glass panels
    • Super Spacer® nXt™ sealant system for optimal thermal performance (standard with triple-pane option)
    • InsulKor multi-cavity foam-filled frame
    • Nail fin accessory for use in remodeling or new construction applications
    • Exclusive locking half screen
    • 1-1/8" simulated divided lite (SDL) grid
    • 5/8" or 1" contoured, or 5/8" or 3/4" flat or diamond grid
    • Obscure or double-strength glass
  • InsulKorTechnologyInsulKor™ technology is a system of sash and frame enhancements that dramatically improves the performance of the Series 3900 double hung window. Our exclusive InsulKor fiberglass enriched polyurethane sash reinforcement yields better energy efficiency while maintaining the structural integrity of traditional metal reinforcement.

    The optional InsulKor foam injections add thermal enhancing insulation in specific hollows of the frame. The combination of foam-filled and dead air chambers optimizes each window’s thermal properties for exceptional R-values.

    When combined with either of our R-5 rated, triple pane glazing systems, these InsulKor enhancements help make the Series 3900 one of the most energy efficient, strongest window systems available today.

Association of Condominium, Townhouse, and Homeowners Associations
Member of Community Associations Institute
National Association of the Remodeling Industry
Certified Vinyl Installer of Vinyl Siding Institute
Certified Vinyl Installer of Vinyl Siding Institute
EPA Lead Safe Certified Firm
Wounded Warrior Project
Average rating for HARRIS ROOFING, SIDING, WINDOWS & DOORS is 4.93 stars of 5 stars - based on 67 reviews
New Window in Wheaton, IL
I was very impressed from beginning to end with my new window project. Would recommend you to anyone without hesitation!
Diane K. - Wheaton, IL 60187