(a) Allowance of credit

In the case of an individual, there shall be allowed as a credit against the tax imposed by this chapter for the taxable year an amount equal to 30 percent of the sum of—

(1) the amount paid or incurred by the taxpayer for qualified energy efficiency improvements installed during such taxable year,

(2) the amount of the residential energy property expenditures paid or incurred by the taxpayer during such taxable year, and

(3) the amount paid or incurred by the taxpayer during the taxable year for home energy audits.

(b) Limitations

(1) In general

The credit allowed under this section with respect to any taxpayer for any taxable year shall not exceed $1,200.

(2) Energy property

The credit allowed under this section by reason of subsection (a)(2) with respect to any taxpayer for any taxable year shall not exceed, with respect to any item of qualified energy property, $600.

(3) Windows

The credit allowed under this section by reason of subsection (a)(1) with respect to any taxpayer for any taxable year shall not exceed, in the aggregate with respect to all exterior windows and skylights, $600.

(4) Doors

The credit allowed under this section by reason of subsection (a)(1) with respect to any taxpayer for any taxable year shall not exceed—

(A) $250 in the case of any exterior door, and

(B) $500 in the aggregate with respect to all exterior doors.

(5) Heat pump and heat pump water heaters; biomass stoves and boilers

Notwithstanding paragraphs (1) and (2), the credit allowed under this section by reason of subsection (a)(2) with respect to any taxpayer for any taxable year shall not, in the aggregate, exceed $2,000 with respect to amounts paid or incurred for property described in clauses (i) and (ii) of subsection (d)(2)(A) and in subsection (d)(2)(B).

(6) Home energy audits

(A) Dollar limitation

The amount of the credit allowed under this section by reason of subsection (a)(3) shall not exceed $150.

(B) Substantiation requirement

No credit shall be allowed under this section by reason of subsection (a)(3) unless the taxpayer includes with the taxpayer’s return of tax such information or documentation as the Secretary may require.

(c) Qualified energy efficiency improvements

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For purposes of this section—

(1) In general

The term “qualified energy efficiency improvements” means any energy efficient building envelope component, 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) Energy efficient building envelope component

The term “energy efficient building envelope component” means a building envelope component which meets—

(A) in the case of an exterior window or skylight, Energy Star most efficient certification requirements,

(B) in the case of an exterior door, applicable Energy Star requirements, and

(C) in the case of any other component, the prescriptive criteria for such component established by the most recent International Energy Conservation Code standard in effect as of the beginning of the calendar year which is 2 years prior to the calendar year in which such component is placed in service.

(3) Building envelope component

The term “building envelope component” means—

(A) any insulation material or system, including air sealing 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), and

(C) exterior doors.

(4) Manufactured homes included

The term “dwelling unit” includes a manufactured home which conforms to Federal Manufactured Home Construction and Safety Standards (Part 3280 of Title 24, Code of Federal Regulations).

(d) Residential energy property expenditures

For purposes of this section—

(1) In general

The term “residential energy property expenditures” means expenditures made by the taxpayer for qualified energy property which is—

(A) installed on or in connection with a dwelling unit located in the United States and used as a residence by the taxpayer, and

(B) originally placed in service by the taxpayer.

Such term includes expenditures for labor costs properly allocable to the onsite preparation, assembly, or original installation of the property.

(2) Qualified energy property

The term “qualified energy property” means any of the following:

(A) Any of the following which meet or exceed the highest efficiency tier (not including any advanced tier) established by the Consortium for Energy Efficiency which is in effect as of the beginning of the calendar year in which the property is placed in service:

(i) An electric or natural gas heat pump water heater.

(ii) An electric or natural gas heat pump.

(iii) A central air conditioner.

(iv) A natural gas, propane, or oil water heater.

(v) A natural gas, propane, or oil furnace or hot water boiler.

(B) A biomass stove or boiler which—

(i) uses the burning of biomass fuel to heat a dwelling unit located in the United States and used as a residence by the taxpayer, or to heat water for use in such a dwelling unit, and

(ii) has a thermal efficiency rating of at least 75 percent (measured by the higher heating value of the fuel).

(C) Any oil furnace or hot water boiler which—

(i) is placed in service after December 31, 2022, and before January 1, 2027, and—

(I) meets or exceeds 2021 Energy Star efficiency criteria, and

(II) is rated by the manufacturer for use with fuel blends at least 20 percent of the volume of which consists of an eligible fuel, or

(ii) is placed in service after December 31, 2026, and—

(I) achieves an annual fuel utilization efficiency rate of not less than 90, and

(II) is rated by the manufacturer for use with fuel blends at least 50 percent of the volume of which consists of an eligible fuel.

(D) Any improvement to, or replacement of, a panelboard, sub-panelboard, branch circuits, or feeders which—

(i) is installed in a manner consistent with the National Electric Code,

(ii) has a load capacity of not less than 200 amps,

(iii) is installed in conjunction with—

(I) any qualified energy efficiency improvements, or

(II) any qualified energy property described in subparagraphs (A) through (C) for which a credit is allowed under this section for expenditures with respect to such property, and

(iv) enables the installation and use of any property described in subclause (I) or (II) of clause (iii).

(3) Eligible fuel

For purposes of paragraph (2), the term “eligible fuel” means—

(A) biodiesel and renewable diesel (within the meaning of section 40A), and

(B) second generation biofuel (within the meaning of section 40).

(e) Home energy audits

For purposes of this section, the term “home energy audit” means an inspection and written report with respect to a dwelling unit located in the United States and owned or used by the taxpayer as the taxpayer’s principal residence (within the meaning of section 121) which—

(1) identifies the most significant and cost-effective energy efficiency improvements with respect to such dwelling unit, including an estimate of the energy and cost savings with respect to each such improvement, and

(2) is conducted and prepared by a home energy auditor that meets the certification or other requirements specified by the Secretary in regulations or other guidance (as prescribed by the Secretary not later than 365 days after the date of the enactment of this subsection).

(f) Special rules

For purposes of this section—

(1) Application of rules

Rules similar to the rules under paragraphs (4), (5), (6), (7), and (8) of section 25D(e) shall apply.

(2) Joint ownership of energy items

(A) In general

Any expenditure otherwise qualifying as an expenditure under this section shall not be treated as failing to so qualify merely because such expenditure was made with respect to two or more dwelling units.

(B) Limits applied separately

In the case of any expenditure described in subparagraph (A), the amount of the credit allowable under subsection (a) shall (subject to paragraph (1)) be computed separately with respect to the amount of the expenditure made for each dwelling unit.

(3) Property financed by subsidized energy financing

For purposes of determining the amount of expenditures made by any individual with respect to any property, there shall not be taken into account expenditures which are made from subsidized energy financing (as defined in section 48(a)(4)(C)).

(g) Basis adjustments

For purposes of this subtitle, if a credit is allowed under this section for any expenditure with respect to any property, the increase in the basis of such property which would (but for this subsection) result from such expenditure shall be reduced by the amount of the credit so allowed.

(h) Termination

This section shall not apply with respect to any property placed in service—

(1) after December 31, 2007, and before January 1, 2009, or

(2) after December 31, 2032.