Energy-Efficient Windows

Windows bring light, warmth, and beauty into buildings and give a feeling of openness and space to living areas. They can also be major sources of heat loss in the winter and heat gain in the summer. In 1990 alone, the energy used to offset unwanted and gains through windows in residential and commercial buildings the United States $20 billion (one-fourth of all the energy used for space heating and ). However, when properly selected and installed, windows can help minimize a home's heating, cooling, and . This article describes one option—energy-efficient windows—available for reducing a home's heating and cooling energy requirements.

conduction and infiltration heat loss