SECTION 2. BACKGROUND
Internal Revenue Bulletin 2008-12 · 2026-10-03 edition · updated 2026-10-04 · United States
.01 In General . Section 45L provides a credit to an eligible contractor who constructs a qualified energy efficient home. For qualified energy efficient homes (other than manufactured homes), the amount of the credit is $2,000. A dwelling unit qualifies for the credit if—
(1) It is located in the United States; (2) Its construction is substantially completed after August 8, 2005;
(3) It meets the energy saving requirements of § 45L(c)(1); and
(4) It is acquired from the eligible contractor after December 31, 2005, and before January 1, 2009, for use as a residence.
.02 Energy Saving Requirements . To meet the energy saving requirements of § 45L(c)(1), a dwelling unit must be certified to provide a level of heating and cooling energy consumption that is at least 50 percent below that of a reference dwelling unit constructed in accordance with the standards of § 404 of the 2004 Supplement to the 2003 International Energy Conservation Code (2004 IECC Supplement), and to have building envelope component improvements that provide for a level of heating and cooling energy consumption that is at least 10 percent below that of a reference dwelling unit.
.03 Calculation Procedures . For purposes of section 2.02 of this notice, heating and cooling energy consumption must be calculated in accordance with the procedures prescribed in Residential Energy Services Network (RESNET) Publication No. 05–001 (Nov. 17, 2005) or No. 06–001 (June 1, 2006) or in accordance with an equivalent calculation procedure.
.04 Acquired from Eligible Contractor . A qualified energy efficient home is acquired from an eligible contractor for use as a residence if the person that constructed the home sells or leases the home to another person for use as a residence. A qualified energy efficient home is not acquired from an eligible contractor if the person that constructed the home retains the home for use as a residence. For example, a
March 24, 2008 647 2008–12 I.R.B.
cation No. 05–001 (Nov. 17, 2005) or No. 06–001 (June 1, 2006).
(7) An equivalent rating network includes, in a state that has established energy efficiency standards under which a dwelling unit is required to achieve a specified aggregate level of heating and cooling energy consumption for any purpose (including compliance with building codes or eligibility for a state grant or tax credit), the state agency administering those standards. Thus, if the agency has accredited or otherwise authorized a person to use energy performance measurement methods approved by the agency for use in determining whether the state’s energy efficiency standards are satisfied, the person so accredited or authorized qualifies as an eligible certifier.
(8) A manufactured home is a dwelling unit constructed in accordance with the Federal Manufactured Home Construction and Safety Standards (24 C.F.R. 3280).
(9) A qualified energy efficient home is a dwelling unit that qualifies for the credit under § 45L. See section 2.01 of this notice for the requirements that a dwelling unit must satisfy to qualify for the credit.
(10) A reference dwelling unit is a dwelling unit that is similar in technical specifications and design to the dwelling unit constructed by the eligible contractor except that—
(a) The reference dwelling unit is constructed in accordance with the minimum standards of Chapter 4 of the 2004 IECC Supplement;
(b) The reference dwelling unit’s air conditioners have a Seasonal Energy Efficiency Ratio (SEER) of 13, measured in accordance with 10 C.F.R. 430.23(m); and
(c) The reference dwelling unit’s heat pumps have a SEER of 13 and a Heating Seasonal Performance Factor (HSPF) of 7.7, measured in accordance with 10 C.F.R. 430.23(m).
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