Energy-Efficient 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 in the summer. In 1990 alone, the energy used to offset unwanted and gains through windows in residential and commercial buildings cost the $20 billion (one-fourth of all the energy used for space ). However, when properly selected and installed, windows can help minimize a home’s heating, cooling, and lighting costs. This article describes one option—energy-efficient windows—available for reducing a home’s energy requirements.

conduction and infiltration heat loss