10 CFR § 431.402
Preemption of State regulations for commercial HVAC & WH products
June 9, 2020
Beginning on the effective date of such standard, an energy conservation standard set forth in this part for a commercial HVAC & WH product supersedes any State or local regulation concerning the energy efficiency or energy use of that product, except as provided for in Section 345(b)(2)(B)-(D) of the Act.