415 ILCS 5/9.19: Refrigerants.

A refrigerant designated as approved in accordance with 42 U.S.C. 7671k shall be allowed for use in the State as long as any equipment containing such refrigerant is listed and installed in accordance with safety standards and use conditions imposed pursuant to such designation. No unit of local government or municipality shall be restricted from authorizing or prohibiting alternative refrigerants otherwise authorized for use in the State.