Employee Owned Employee Proud

Thermo Twin | Associations

  • Windows

    Custom Built & Replacement

    Thermo-Twin is an industry leader in custom built, high-quality windows. We offer a wide range of options in different materials and styles.

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  • Sunrooms

    Quality Craftsmanship

    The durability and strength of our insulated roof panels are certified by licensed structural engineers to comply, meet, or exceed all building codes.

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  • Vinyl Windows

    Energy Efficient

    Our multi-chambered frames and sashes are manufactured from 100% virgin vinyl to provide outstanding strength and rigidity along with low maintenance.

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  • Doors

    Fiberglass and Steel Entry Doors

    Beautiful and Energy Efficient Doors Compliment Your Home

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  • Employee Owned

    Pittsburgh Made

    We build all of our custom windows and sunrooms at our manufacturing facility in Pittsburgh, Pennsylvania.

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Pride in Craftsmanship

Pittsburgh's Only Complete Window Manufacturer

Thermo-Twin has been providing window solutions to the Pittsburgh region for over 47 years. Founded in 1972, our employee owned company has evolved from being a glass supplier to the window manufacturer and remodeling company that we are today. Our expertise is in constructing, designing and installing replacement vinyl windows, doors, and sunrooms. We are proud to be an employee owned company, and we’ve made it our priority to deliver quality products which are made locally in Oakmont, PA.

Pride in Craftsmanship
Start to FinishPridein Craftsmanship
Over 40 Years of Satisfied Customers
Over47 Yearsof Satisfied Customers
Our Team is 100% Employee Owned
Our Team100%Employee-Owned
Manufactured Locally
ManufacturedLocallyPittsburgh is Home
Professionally Installed with Precision
ProfessionallyInstalledwith Precision


No Payments Until 2022*

* Approval and Financing by Synchrony Bank. Sold and Installed by our Retail Sales Division.
*  Can not be used with previous orders or specials.
* Winter Special Expires 02/29/2019.


All Custom Built in Pittsburgh, PA

Thermo Twin Replacement Windows

Thermo-Twin is an industry leader in custom built, high-quality windows. We offer a wide range of options in different materials and styles. From state-of-the-art vinyl to aesthetically pleasing wood windows, Thermo-Twin has a solution for every job. Get your windows done right the first time, and you won’t have to worry about replacement windows for years to come. Choose Thermo-Twin.

Thermo Twin Custom Built Sunrooms

Weather can be harsh year round. From freezing winter temperatures to sweltering August sun, your home's windows are being constantly challenged. If you rely on old and outdated windows to keep your home's temperature regulated then you may be throwing away as much as 30% of your heating and cooling costs. Fortunately, all Thermo-Twin windows come standard with Super-Spacer technology, the world's most energy-efficient insulated glass system in the world.

Browse our wide array of window offerings, and then pick up the phone or click the Contact For Free Estimate button to inquire about having Thermo-Twin windows installed in your home.

Thermo Twin | Super Spacer® Technology

Thermo-Twin windows are equipped with first-in-class Super Spacer® technology. For the homeowner, this means quality and energy efficiency. Super Spacer® technology reduces condensation and makes for a quieter window product. Made of silicone materials, Super Spacers® are superior to their metal counterparts and help us to create some of the most energy-efficient insulated glass systems on the market.

We Do Windows from Start to Finish