Wyo. Stat. Ann. § 35-33-101 Regulation of refrigerants.
The use of a refrigerant designated acceptable pursuant to federal rules promulgated pursuant to 42 U.S.C. 7671k shall not be prohibited or regulated by any code, ordinance, rule or regulation of any state or local agency or any political subdivision of the state of Wyoming provided that any equipment containing a refrigerant shall otherwise be utilized and installed in accordance with all applicable laws, rules and regulations.