Stricter rules apply to energy saving home improvements.
You can claim a tax credit for energy saving home improvements you make this year, but stricter rules apply for 2011 than for 2010. You can only claim a 10% credit for qualified energy property placed in service in 2011 up to a $500 lifetime limit (with no more than $200 from windows and skylights). What's more, the credit you claim for any year can't exceed $500 less the total of the credits you claimed for all earlier tax years ending after Dec. 31, 2005. The amount you claim for windows and skylights in a year can't exceed $200 less the total of the credits you claimed for these items in all earlier tax years ending after Dec. 31, 2005. The credit is equal to the sum of: (1) 10% of the amount you pay or incur for qualified energy efficient improvements (such as insulation, exterior windows or doors that meet certain energy efficient standards) installed during the year; and (2) the amount of the residential energy property expenses you paid or incurred during the year.
The credit for residential energy property expenses can't exceed: (A) $50 for an advanced main circulating fan; (B) $150 for any qualified natural gas, propane, or hot water boiler; and (C) $300 for any item of energy efficient property (advanced types of energy saving equipment, such as electric heat pumps, meeting specific energy efficient standards).