The U. S. Department of Energy (DOE) has issued a final rule to address the requirement in section 413 of the Energy Independence and Security Act of 2007 (EISA) that DOE establish energy conservation standards for manufactured housing. See 42 U.S.C. 1707(a)(1). DOE is directed by EISA to base the energy efficiency standards on the most recent version of the International Energy Conservation Code (IECC), except where DOE finds that the IECC is not cost effective, or a more stringent standard would be more cost effective, based on the impact of the IECC on the purchase price of manufactured housing and on total life-cycle construction and operating costs. The established standards provide a set of "tiered" standards based on the size of the manufactured home (single-section or multi-section) that would apply the 2021 IECC -based standards to manufactured homes, with less stringent building thermal envelope requirements for single-section manufactured homes.