NT Window Twinsulator™ Aluminum Windows

NT Window


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Twinsulator™ aluminum windows are crafted from powder-coated aluminum extrusions, which offers strength and thermal performance. These windows require little to no maintenance.

  • Made in USA
  • Energy Star certified to help you save energy
  • 45 years of Remodeling Excellence

Twinsulator™ aluminum windows have the slimmest frames. Aluminum windows allow homeowners to maximize glass surface and views without distracting frames. 

NT's aluminum series is crafted from powder-coated aluminum extrusions which offer strength and thermal performance. 

  • The very best in aluminum window construction
  • Engineered and constructed for extreme weather protection and energy efficiency
  • Designed for residential and light commercial applications
  • ThermaProtect™ insulation barrier improves the window's performance
  • Lifetime Limited Warranty (refers to Twinsulator Series Residential Product Warranty)


  • Features
  • Colors
  • Grids & Glass
  • Styles
  • Performance
  • A: Powder coated aluminum extrusions

    B. ThermaProtect thermal break insulation barrier to protect from the elements

    C. 3/4" dual glaze cardinal LowE 366 Double Strength Glass

    D. Warm edge super spacer for increased efficiency



  • Creme White
  • Bronze
  • Black
Grids & Glass

Grid Options

  • Display Image
    Internal - Flat
  • Display Image
    Internal - Contoured


  • Display Image
  • Display Image

Window Styles

  • Display Image
    Single Hung
  • Display Image
  • Display Image

Twinsulator Glass Performance

  • Single Hung

    U-Factor: 0.43
    SHGC: 0.23
    Frame Depth: 2-5/8"
    AAMA Rating: C40

    Dual Pane, Cardinal LoE3-366 with Argon

  • Sliding

    U-Factor: 0.42
    SHGC: 0.22
    Frame Depth: 2-5/8"
    AAMA Rating: LC40

    Dual Pane, Cardinal LoE3-366 with Argon

  • Picture

    U-Factor: 0.33
    SHGC: 0.25
    Frame Depth: 2-5/8"
    AAMA Rating: LC60

    Dual Pane, Cardinal LoE3-366 with Argon

So far I have enjoyed my new windows very much! Lets plenty of sunlight into my house now. No more feeling drafts coming from the windows.

— Sheila, Review from NTwindow.com

Product Specs

Brand NT Windows
Series Twinsulator™
Exterior Color Creme White, Bronze, Black
Interior Color Creme White, Bronze, Black
Composition Aluminum extrusions
Construction Type New construction, replacement, or commercial
Styles Single Hung, Slider, Picture, Specialty Shape
Frame 2-5/8"
Thermally Broken Frame Yes
Thermally Broken Sash Yes
New Construction Fin Optional
Mobile/Stucco Fin Optional
NFRC Ratings Yes
WDMA Hallmark Certification Yes
AAMA Certification Yes
Warranty - Residential Lifetime
Warranty - Commercial 10 Year (Extended available)

Ratings & Reviews for NT Window Twinsulator™

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5 / 5 Stars
would recommend

Cindy W.

Zip Code: 75159 (Combine, "TX")

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NT Window Twinsulator™
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The windows gave my childhood home a face-lift right away

Brennan Enterprises came highly recommended from a family friend and they were wonderful from the first phone call to installation. The windows gave my childhood home a face-lift right away and they're so easy to open & close! Seriously, one of the best purchases we made while renovating our home.


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