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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. Vinyl is a natural insulator that will make your home more energy efficient. 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.