Construction: housing; ordinance prohibiting the use of energy-efficient appliances in new or existing residential buildings; prohibit local units of government from enacting. Amends sec. 13a of 1972 PA 230 (MCL 125.1513a).

SB 84 prevents local governments (like cities or counties) from banning gas-burning appliances in residential buildings. It specifically stops ordinances that would prohibit the use of certain gas appliances - such as furnaces, dryers, and stoves - that rely on a continuously burning pilot light (small constant flame) for operation. The bill includes exceptions for mobile homes, propane-only appliances, and models meeting federal energy efficiency standards. This law requires local governments to allow these gas appliances in new or existing homes, overriding any conflicting local rules.