; or (B) the Secretary of Housing and Urban Development makes a positive determination under paragraph (3). (2) Exception Paragraph (1) of this subsection shall not apply to any category of housing with respect to which the Secretary of Housing and Urban Development or the Secretary of Agriculture determines that compliance with such revised code or standard would not be technologically feasible or economically justified. (3) Determination If the Secretary of Energy fails to make a determination under section 304 of the Energy Conservation and Production Act ( 42 U.S.C. 6833 ) by the deadline under such section, within 1 year of such deadline the Secretary of Housing and Urban Development shall determine whether compliance with such revised code or standard will improve energy efficiency, be technologically feasible, and be economically justified for housing subject to subsection (b)(1). (d) Additional or different standards (1) In general The Secretary of Housing and Urban Development and the Secretary of Agriculture may jointly or separately establish additional or different energy efficiency requirements for housing specified in subsection (a) if they are at least as stringent as the code or standard applicable under this section. (2) Continuation of existing requirements Any energy efficiency requirements for new construction and rehabilitation of housing specified in subsection (a) established by the Secretary of Housing and Urban Development or the Secretary of Agriculture prior to the date of the enactment of the Housing Efficiency Standards Act of 2020 shall remain in effect to the extent they are more stringent than the code or standard applicable under this section. (e) Implementation (1) Guidance regarding standards The Secretary of Housing and Urban Development and the Secretary of Agriculture shall revise guidance, handbooks, builder certifications, and other relevant documents to incorporate the requirements under this section— (A) not later than the expiration of the 10-month period beginning on