PUBLIC LAW 109–58—AUG. 8, 2005
119 STAT. 1027
‘‘(1) LIFETIME LIMITATION.—The credit allowed under this section with respect to any taxpayer for any taxable year shall not exceed the excess (if any) of $500 over the aggregate credits allowed under this section with respect to such taxpayer for all prior taxable years. ‘‘(2) WINDOWS.—In the case of amounts paid or incurred for components described in subsection (c)(3)(B) by any taxpayer for any taxable year, the credit allowed under this section with respect to such amounts for such year shall not exceed the excess (if any) of $200 over the aggregate credits allowed under this section with respect to such amounts for all prior taxable years. ‘‘(3) LIMITATION ON RESIDENTIAL ENERGY PROPERTY EXPENDITURES.—The amount of the credit allowed under this section by reason of subsection (a)(2) shall not exceed— ‘‘(A) $50 for any advanced main air circulating fan, ‘‘(B) $150 for any qualified natural gas, propane, or oil furnace or hot water boiler, and ‘‘(C) $300 for any item of energy-efficient building property. ‘‘(c) QUALIFIED ENERGY EFFICIENCY IMPROVEMENTS.—For purposes of this section— ‘‘(1) IN GENERAL.—The term ‘qualified energy efficiency improvements’ means any energy efficient building envelope component which meets the prescriptive criteria for such component established by the 2000 International Energy Conservation Code, as such Code (including supplements) is in effect on the date of the enactment of this section (or, in the case of a metal roof with appropriate pigmented coatings which meet the Energy Star program requirements), if— ‘‘(A) such component is installed in or on a dwelling unit located in the United States and owned and used by the taxpayer as the taxpayer’s principal residence (within the meaning of section 121), ‘‘(B) the original use of such component commences with the taxpayer, and ‘‘(C) such component reasonably can be expected to remain in use for at least 5 years. ‘‘(2) BUILDING ENVELOPE COMPONENT.—The term ‘building envelope component’ means— ‘‘(A) any insulation material or system which is specifically and primarily designed to reduce the heat loss or gain of a dwelling unit when installed in or on such dwelling unit, ‘‘(B) exterior windows (including skylights), ‘‘(C) exterior doors, and ‘‘(D) any metal roof installed on a dwelling unit, but only if such roof has appropriate pigmented coatings which are specifically and primarily designed to reduce the heat gain of such dwelling unit. ‘‘(3) MANUFACTURED HOMES INCLUDED.—The term ‘dwelling unit’ includes a manufactured home which conforms to Federal Manufactured Home Construction and Safety Standards (section 3280 of title 24, Code of Federal Regulations). ‘‘(d) RESIDENTIAL ENERGY PROPERTY EXPENDITURES.—For purposes of this section—
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