HRS §107-32
Building codes cannot ban approved refrigerants
Hawaii and county building codes cannot stop you from using a refrigerant that the federal government has approved. But the equipment holding that refrigerant must be certified and installed following all safety rules and conditions.
everyone
The statute, as written — Refrigerant use
No provision of the Hawaii state building codes or any county building code shall prohibit or otherwise limit the use of a refrigerant designated as acceptable for use pursuant to title 42 United States Code section 7671k; provided that any equipment containing the refrigerant shall be listed and installed in accordance with any applicable safety standards and use conditions imposed for that equipment or refrigerant.
LawTrove is not legal advice. The summary above is a computer-generated restatement — the authoritative text is the official version linked above.