This video is for on-site maintenance training for refrigeration and air conditioning equipment. For refrigeration equipment, it provides easy and detailed explanations of various peripheral devices related to cold storage maintenance, cooler maintenance, and quick-freezer maintenance. For air conditioning equipment, it provides training necessary for repairing indoor and outdoor units from small household to commercial use, focusing on air conditioners. The Creator is an expert with 25 years of experience in operating an air conditioning and refrigeration equipment company and holds a national technical qualification license. Therefore, the information and knowledge provided on this channel will be practical skills that can be directly utilized in the field.