Energy Savings

Benefits of ENERGY STAR® Qualified Windows, Doors, and Skylights

Save Money — and More. Choose ENERGY STAR® Qualified Products.

Installing ENERGY STAR® qualified windows, doors, and skylights shrinks energy bills — and carbon footprints — by about 7-15 percent compared to non-qualified products.

Your estimated savings will vary depending on current heating and cooling costs in your region.

For a typical home, choose ENERGY STAR® and save:



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 Administration’s (EIA) 2005 Residential Energy Consumption Survey. Estimates use the EIA’s 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.

Get Comfortable

Comfort. It’s the essential quality of home. ENERGY STAR® qualified windows, doors, and skylights do more than just lower energy bills — they deliver comfort that other products just can’t match.


On cold winter nights, do you avoid seats near the window? The cold, inside surface of an inefficient window pulls heat away from your body, so you can feel chilly in a sweater with the thermostat at 70 degrees. With ENERGY STAR® qualified windows, the interior glass stays warmer, so you can enjoy your window seat even when the temperature outside dips well below freezing.


Do some of your rooms feel like a sauna in the summer? A standard double-pane window allows approximately 75 percent of the sun’s heat into your home.1 With ENERGY STAR® qualified windows you can stay cool all summer long. Most ENERGY STAR® qualified windows reduce the “heat gain” into your home more than typical windows do, without reducing the visible light. You get the light you need without the uncomfortable heat.

1 Source: Residential Windows. Carmody, Selkowitz, Arasteh, and Heschong. 2007.

Protect Your Valuables

Drapes, wood floors, a favorite photograph: all these things can fade or discolor after repeated exposure to direct sunlight. Whether their value is monetary or sentimental, you want to protect your belongings from fading and discoloring.

ENERGY STAR® qualified windows have coatings that keep out the summer heat and act like sunscreen for your house, protecting your valuables from harmful, fading ultraviolet light without noticeably reducing visible light. These special coatings reduce fading by up to 75 percent.1

1 Source: Residential Windows. Carmody, Selkowitz, Arasteh, and Heschong. 2007.

What is a Carbon Footprint?

Your personal carbon footprint measures the carbon dioxide (CO2) emissions caused by your activities. It includes CO2 emissions from such things as driving your car or flying in a plane, the manufacture and distribution of the products you buy, and turning on the lights in your home. A carbon footprint is usually measured in pounds or tons of CO2 per year.

Home energy use accounts for about one-quarter of your carbon footprint, but this can vary depending on the kinds of energy sources available to power your home. ENERGY STAR® calculates carbon savings for ENERGY STAR® qualified windows, doors, and skylights based on the mix of fuels in a region and the estimated energy use for a typical home.