DeSCo Windows. An excellent choice for your next project. Since 1970, DeSCo has earned its reputation as a high quality, service-oriented manufacturer for a diverse line of architectural windows. DeSCo?s five lines of aluminum windows have been engineered to ensure high performance in a wide variety of applications¨schools, hospitals, office buildings, institutional buildings, and churches¨in both new construction and retrofit projects. DeSCo windows are manufactured to industry-leading standards, using only the finest materials available. Our engineers continually advance our products, assuring your next project will be a beautiful, tough, conservation-conscious window.