01142nas a2200121   4500008004100000050001500041245009000056210006900146520068100215100002100896700002500917856007800942       2006                        eng d  aLBNL-6014600aWindow-Related Energy Consumption in the US Residential and Commercial Building Stock0 aWindowRelated Energy Consumption in the US Residential and Comme3 a<p>We present a simple spreadsheet-based tool for estimating window-related energy consumption in the United States. Using available data on the properties of the installed US window stock, we estimate that windows are responsible for 2.15 quadrillion Btu (Quads) of heating energy consumption and 1.48 Quads of cooling energy consumption annually. We develop estimates of average U-factor and SHGC for current window sales. We estimate that a complete replacement of the installed window stock with these products would result in energy savings of approximately 1.2 quads. We demonstrate that future window technologies offer energy savings potentials of up to 3.9 Quads.</p>1 aApte, Joshua, S.1 aArasteh, Dariush, K.  uhttps://facades.lbl.gov/publications/window-related-energy-consumption-us