Saving Energy: Windows & Doors

Even if you have old, drafty windows, you can cut down energy loss by using cost-effective thermal window coverings.

Standard window blinds have an insulating value of only R-1. The best way to insulate your windows is using several layers of window dressings.

Using shades, sheers and especially heavier draperies with insulated linings can dramatically cut back on heat loss – raising the R-value of a single-pane window from R-1 up to R-6!

Cellular shades

Instead of a typical vinyl pull-down shade, take a look at the new "honeycomb" or "cellular" shades made of fabric.

The air pockets provide an extra layer of insulation, blocking up to 62 percent of the heat transfer through the window pane.

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Are you an Alliant Energy customer?

If you’re an Alliant Energy utility customer in Iowa or Minnesota, you can earn cash back when you purchase high-efficiency EnergyStar replacement windows!

Looking for an energy-smart window dealer?

Try Alliant Energy’s online Dealer Locator to find experts in your area.

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Brochures and fact sheets:

PowerHouse: Weatherizing Your Home
By Alliant Energy [PDF format]

PowerHouse: Energy-Efficient New Home Construction
By Alliant Energy [PDF format]

Energy-Efficient Windows
By the U.S. Department of Energy [PDF format]

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Learn more:

EnergyStar Windows, Doors and Skylights
Find lists of qualifying products and where to buy them.

Efficient Windows
This non-profit site provides unbiased information about the benefits of high-performance windows.

National Fenestration Ratings Council
This trade organization oversees the testing and energy rating of windows and doors.