• Phone: 800-245-1540
  • marketing@thermalwd.com

Our Company

A Window Manufacturer Committed to Quality

With over 50 years experience as a vinyl window manufacturer, Thermal Windows & Doors has developed an extensive line of high quality, ENERGY STAR® qualified Vinyl Replacement Windows and Patio Doors that help millions of homeowners to live more comfortably while saving money on their heating and cooling bills.

Thermal Windows & Doors manufactures our replacement windows and patio doors with the highest quality vinyl materials. Using vinyl also makes Thermal’s replacement windows and patio doors maintenance-free, meaning they will never need painting or scraping, and will not rot, chip or peel. Plus, each replacement window and patio door we manufacture is custom-sized for specific window openings in your home for quick installation and the perfect fit.

Our Mission


Produce industry leading results in all aspects of our business.


Create a culture of disciplined responsibility and accountability.


Passionately meet customer needs by providing world class products and services.


Attract and retain the best people who work together as a team with integrity and respect.

History in Words

First Vinyl Replacement Windows

Thermal Windows & Doors introduced America to the first custom-vinyl replacement window. Late 1960’s, Thermal developed an insulating glass vinyl replacement window with a tilt-in sash design for easy cleaning.

First Custom Bow and Bay Windows

Late 1970’s, Thermal introduced the first custom Bow and Bay Window designs. They also introduced the industries first Custom Casement Windows with fusion-welded frame and sash.

First Garden Windows and L’egance Sliding Glass Patio Door

In 1983, Thermal started producing Custom Garden Windows. In 1984, they introduced stellar fused frame & sash for Double Hung and Slider Windows. Then  in 1986, the created the L’egance Sliding Glass Patio Door.

Thermal Takes Giant Leaps 

In the mid-1990’s, Thermal Windows & Doors incorporated their custom vinyl window and door systems into an insulating, polystyrene wall system to create the DreamspacE Patio Enclosure System. Also in the mid-90s, Thermal took a giant step into the outdoor products market with the innovative vinyl Dream Deck and Dream Rail Systems. These systems introduced homeowners to the world of Barefoot Friendly™ and maintenance-free deck surfaces.

New Millennium Welcomes New Creations and Changes

The new millennium began for Thermal Windows & Doors with creation of the ASPECT (Advanced Structural Performance Engineering Technology) family of double hung window products. The design of parallel I-beam frame construction and enhanced water management create a system that exceeds NFRC and AAMA standards for air and water infiltration. the L’egance Patio Door II was also introduced. 

Federal Energy Tax Credit and Perk Performance Glass

Thermal Windows and Doors offers a wide variety of products that quality for Federal Energy Tax Credits when specified with glass packages from Peak Performance Family of Glass Systems. 

Park Avenue Series 9500 and 9400

Thermal Windows & Doors launched the Park Avenue Series 9500 window. It also launched first ever new construction window, the Park Avenue Series 9400.