Windows and Home Insulation

How do windows insulate my home?

The construction and installation of a window determine how well it insulates. Windows insulate by reducing heat flow, which is the transfer of heat from a warm space to a cooler space. Modern windows with double or triple glazed units and Low-E coatings insulate much better than IGUs with glass without coating as Low-E coatings reflect heat energy from the window to further improve its insulating properties.