Executive Summary / Abstract

Residential Windows, Greenhouse Gas Emissions and the Potential of Emerging Window Technologies

Joshua Schulz Apte - May 2004

Windows are typically considered to be some of the least energy – efficient components in the residential building envelope in the US, yet few studies have characterized their aggregate energy and environmental impacts.  This study combines a national survey of residential energy end uses with computer simulations of window energy performance to estimate the primary energy consumption and carbon emissions associated with residential windows.  We consider potential energy savings from the complete replacement of the US window stock with both present and future high-performance fenestration technologies.  We find that tomorrow’s high performance windows have the potential for dramatic reductions in the energy consumption and carbon emissions associated with the US residential window stock, and a 10% reduction in emissions and consumption associated with residential heating and cooling.