These high-performance windows feature double or triple glazing, specialized transparent coatings, insulating gas sandwiched between panes, and improved frames. High-performance, energy-efficient window and glazing systems are now available that can dramatically cut energy consumption and pollution sources: they have lower heat loss, less air leakage, and warmer window surfaces that improve comfort and minimize condensation. In recent years, windows have undergone a technological revolution. In 1990 alone, the energy used to offset unwanted heat losses and gains through windows in residential and commercial buildings cost the United States $20 billion (one-fourth of all the energy used for space heating and cooling).
However, windows also represent a major source of unwanted heat loss, discomfort, and condensation problems. Many studies have even shown that health, comfort, and productivity are improved due to well-ventilated indoor environments and access to natural light.
Windows have long been used in buildings for daylighting and ventilation.
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