701.503.  Rulemaking authority. — 1.  In conjunction with the advisory group under section 701.509, the director shall promulgate, by rule, the minimum energy efficiency standards for the products in subsection 2 of section 701.500.  Any rule or portion of a rule, as that term is defined in section 536.010, that is created under the authority delegated in this section shall become effective only if it complies with and is subject to all of the provisions of chapter 536 and, if applicable, section 536.028.  This section and chapter 536 are nonseverable and if any of the powers vested with the general assembly pursuant to chapter 536 to review, to delay the effective date, or to disapprove and annul a rule are subsequently held unconstitutional, then the grant of rulemaking authority and any rule proposed or adopted after August 28, 2008, shall be invalid and void.

  2.  The standards enacted by the director, in conjunction with the advisory group under section 701.509, shall not be more stringent than the federal energy star program requirements, if such requirements are applicable.