Although they typically block more light than heat, reflective coatings, when applied to tinted or clear glass, can also slow the transmission of heat. Also, optical properties such as solar transmittance can be customized for specific climate zones. The heat from even a small amount of diffuse winter sunlight will convert these super-windows into net suppliers of energy. Both types should be on the market within 2 to 5 years. Conclusion No one type of glazing is suitable for every application.
Many materials are available that serve different purposes.
Moreover, consumers may discover that they need two types of glazing for a home because of the directions that the windows face and the local climate. To make wise purchases, consumers should first examine their heating and cooling needs and prioritize desired features such as daylighting, solar heating, shading, ventilation, and aesthetic value. The following organizations and publications provide more information on advances in glazing technology. 5-7, March 1990. 92-98, June 1993.