Windows provide light and necessary ventilation in buildings. However, they can also negatively affect a building’s energy efficiency through loss of heating and cooling. Installing energy-efficient windows is one of the easiest ways to achieve higher savings on energy bills.
Buildings owners can improve the energy efficiency of existing windows through weatherization, caulking, and by using window treatments and coverings that reduce air leakage. Caulking is applied to gaps, cracks or joints in windows to prevent air leakage and reduce the load on HVAC systems. Window treatments can reduce heat loss in winter and infiltration during the summer. Low emissivity (low-e) window glazing is used to help achieve this in heating climates.
Windows replacement costs will vary for different buildings depending on the type and number of windows on each floor, masonry & construction, overhangs, operable components and other design and façade elements. Energy saving windows coupled with other window design elements such as awnings, weather-stripping, hoppers, double-hangs and casements can help building owners get the most savings out of energy efficient windows installations.