With 50 years of experience in the vinyl window manufacturing industry, Thermal Industries, Inc. 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 Industries 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 Industries' 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.