This image shows the regional annual savings when upgrading to ENERGY STAR qualified windows from either single-pane or double-pane, clear glass windows. The source for these savings is the U.S. Department of Energy. Savings estimates based on an even mix of one- and two-story detached homes of 1700 or 2600 sq. ft. respectively, with 15% of their floor space in windows that are equally distributed across compass directions.

This image shows the regional annual savings when upgrading to ENERGY STAR qualified windows from either single-pane or double-pane, clear glass windows. The source for these savings is the U.S. Department of Energy. Savings estimates based on an even mix of one- and two-story detached homes of 1700 or 2600 sq. ft. respectively, with 15% of their floor space in windows that are equally distributed across compass directions. Heating and cooling systems are modeled as either natural gas heat with electric air conditioning or electric heat pump, according to the regional breakdown reported in the Energy Information Administrationís (EIA) 2005 Residential Energy Consumption Survey. Estimates use the EIAís 2006 average natural gas prices and 2007 electricity prices. Actual savings will vary by local climatic conditions, utility rates, and individual home characteristics. Hawaii was excluded from this analysis, as the assumptions in the standard software program used for calculating the impact of windows on heating and cooling costs for the residential sector diverge significantly from the norm in Hawaii.

Northwest
$258 Single-pane window
$112 Double-pane window, clear glass
California
$146 Single-pane window
$71 Double-pane window, clear glass
West South Central
$273 Single-pane window
$159 Double-pane window, clear glass
Mountain
$294 Single-pane window
$148 Double-pane window, clear glass
West North Central
$353 Single-pane window
$145 Double-pane window, clear glass
East South Central
$195 Single-pane window
$88 Double-pane window, clear glass
East North Central
$372 Single-pane window
$160 Double-pane window, clear glass
South Atlantic
$213 Single-pane window
$86 Double-pane window, clear glass
Florida
$313 Single-pane window
$247 Double-pane window, clear glass
Middle Atlantic
$401 Single-pane window
$166 Double-pane window, clear glass
New England
$501 Single-pane window
$208 Double-pane window, clear glass