42 U.S.C. § 8235

“Residential building” defined

As used in this part, the term “residential building” means any building used as a residence which is not a new building to which final standards under sections 6833(a) and 6834 of this title apply and which has a system for heating, cooling, or both.

( Pub. L. 95–619, title II, § 261 , as added Pub. L. 96–294, title V, § 562 , June 30, 1980 , 94 Stat. 746 .)