Windows and Home Insulation

How do windows insulate my home?

Energy transfer takes place through conduction, convection, and radiation. Residential window glazing assemblies are typically comprised of two glass lites, separated by a narrow cavity that is desiccated and filled with argon gas. The absence of solid mass within the cavity impedes conductive energy transfer, the limited gas circulation impedes convective transfer, and the presence of a low-e coating on one of the lites helps to reflect long-wave infrared radiation.