http://www.irs.gov/publications/p17/ch37.html#en_US_publink1000174954 …
Nonbusiness energy property credit. You may be able to take a credit of 30% of the costs paid or incurred in 2009 for any qualified energy efficiency improvements and any residential energy property.
The credit is limited to a total of $1,500 for 2009 and 2010.
Qualified energy efficiency improvements are the following improvements that are new, can be expected to remain in use at least 5 years, and meet certain requirements for energy efficiency.
- Any insulation material or system that is specifically and primarily designed to reduce heat loss or gain of a home.
- Exterior windows (including skylights).
- Exterior doors.
- Any metal or asphalt roof that has appropriate pigmented coatings or cooling granules specifically and primarily designed to reduce heat gain of the home.
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http://www.irs.gov/pub/irs-dft/f5695--dft.pdf