Lang Insulated Glass Units

Did you know that Lang Exterior manufactures and sells Insulated Glass Units in addition to complete windows? Our customers can order IGUs with the same glass options as our windows, including grids, V-Groove, Enhanced Glass with Argon and Low-E and many more!

> How to become a Lang customer

Now Available: Aluminum Windows

Did you know Lang Exterior offers aluminum windows? Ultra Tuff aluminum windows are perfect for commercial or residential use and have an innovative thermal break that makes them unbeatable for interior comfort.

> See Ultra-Tuff Aluminum Double-Hung Windows           > Check Out Ultra-Tuff Aluminum Picture Windows

If Better Windows Could Be Built...

They would be built by Lang!

We manufacture the windows and patio doors we sell, right down to the insulated glass units! Click here to browse all our window types.

Look for the Lang Exterior Window Sticker!

You know it's a quality product when you see our logo! The image at left shows the sticker that comes on every window we make.

Remember that Lang Exterior products are and have always been made in the USA! Learn more:

> VIDEO: Products made in the USA
> VIDEO: IGU production at our factory - showing the Lang sticker applied to the glass as a final production step

We Will Not Be Undersold!

Show us a lower price on a comparable window or patio door and we will beat that price by 10%!* That's our 10% price guarantee, and it proves how dedicated we are to the highest quality products at the lowest prices.

> Learn more about our price guarantee.
> Ask us about our price guarantee.     (*Exclusions apply.)

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How-To Videos by Lang Exterior


Learn how to clean the exterior of a Lang double-hung window. Learn about removing a sliding window sash and check out all of our other videos.

See Videos on Operating Lang Windows
More Videos: Inside Our Factories in Chicago, Illinois

 

Triple-Pane R5 Windows
U-Value .20!

R5 is the most energy efficient triple-pane option available.

Learn more about R5 triple pane windows and doors

View products with the R5 option:

Platinum Series
Powerweld Series
Renaissance Series
Glide Patio Doors


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