1. Short title This Act may be cited as the Housing Efficiency Standards Act of 2020 . 2. Energy efficiency standards Section 109 of the Cranston-Gonzalez National Affordable Housing Act ( 42 U.S.C. 12709 ) is amended to read as follows: 109. Energy efficiency standards (a) Covered buildings The requirements in this section shall apply to— (1) new construction of public and assisted housing and single family and multifamily residential housing subject to mortgages insured under the National Housing Act ( 12 U.S.C. 1701 et seq.); (2) new construction of single family and multifamily housing subject to mortgages insured, guaranteed, or made by the Secretary of Agriculture under title V of the Housing Act of 1949 ( 42 U.S.C. 1471 et seq.); and (3) rehabilitation and new construction of public and assisted housing funded under the United States Housing Act of 1937 ( 42 U.S.C. 1437 et seq.). (b) Initial requirement (1) In general Beginning 1 year after the date of enactment of this section, all new construction and rehabilitation of housing specified in subsection (a), but not including any manufactured home, shall meet the requirements of the 2018 International Energy Conservation Code (in this section referred to as the IECC ), or, in the case of multifamily high rises, the requirements of ANSI/ASHRAE/IES Standard 90.1–2019. (2) Manufactured homes Beginning 1 year after the date of enactment of this section, all new construction of manufactured homes specified in subsection (a) shall meet— (A) the requirements of Energy Star Certified Manufactured Homes