Abstract: Focusing on three 2024 editions of standards (GB/T 4706.1—2024, GB/T 4706.32—2024, and GB 4343.1—2024) as the basis for mandatory certification of air-conditioners, the core technical differences between the new and old standards regarding safety protection and electromagnetic compatibility requirements are systematically reviewed, with particular emphasis on distinguishing special provisions for non-flammable and A2L flammable refrigerant products. Clarifies the phased transition arrangements for certification updates and the implementation procedures enterprises must follow, covering key steps such as gap assessment, supplementary testing, and document updating. The analysis reveals that successfully addressing this standard transition requires tripartite collaboration among manufacturers, testing institutions, and certification bodies: manufacturers should establish compliance management systems and optimize testing strategies; testing institutions need to enhance capabilities and technical services; certification bodies should streamline processes and provide guidance. Collaboration among these three parties is crucial for ensuring a smooth industry transition and enhancing overall safety standards.

Key words: Air conditioner, compulsory certification, standard revision