The U. S. Department of Energy (DOE) will issue 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. In August 2021, DOE proposed two potential approaches one would provide a set of "tiered" standards based on the manufacturer’s retail list price for the manufactured home that would apply the 2021 IECC -based standards to manufactured homes, except that manufactured homes with a manufacturer’s retail list price of $55,000 and below would be subject to less stringent building thermal envelope requirements based on manufacturer’s retail list price. The alternative approach would apply standards based on the 2021 IECC to all manufacturer’s retail list price (86 FR 47744).