2013 Tax Credit for Energy Efficient Windows, Doors

1. U-Factor

Range: 0.20 to 1.20

The lower the number, the better an insulator the window or door is. A low U-factor means that less heat escapes in the winter, which makes it particularly important in cold northern climates, according to the Collaborative, a coalition of government agencies, research organizations, and manufacturers that promote efficient window technology.

Tax credit qualification requirement: 0.3 or less

2. Solar Heat Gain Coefficient (SHGC)

Range: 0 to 1

The lower the number, the less solar radiation—and heat—the window or door allows inside. SHGC refers to the solar radiation a window or door allows inside. Seek the lowest possible SHGC rating in warm climates to minimize the use of air conditioning. Look for a slightly higher number in cooler climates so that the sun can help heat your home in winter, but be sure to balance SHGC with an efficient U-factor for your area.

Tax credit qualification requirement: 0.3 or less

Before Buying New Windows:

You need to know about buying energy efficient windows. Replacing all old windows with energy efficient windows can be very expensive, from $8,000-$15,000 or more for a typical home. In most cases you can get the same energy savings by investing $1,000 or so in insulation, sealing air leaks, and repairing your windows instead of replacing. In many cases, but not all cases, repairing windows may be the smarter option.

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