42 U.S.C. § 15841
Energy-efficient appliances
In purchasing appliances, a public housing agency shall purchase energy-efficient appliances that are Energy Star products or FEMP-designated products, as such terms are defined in section 8259b of this title , unless the purchase of energy-efficient appliances is not cost-effective to the agency.
( Pub. L. 109–58, title I, § 152 , Aug. 8, 2005 , 119 Stat. 649 .)