The book "Repair of refrigerators, air conditioners and heating devices" was written due to the lack of training manuals with an exhaustive description of the laws of electricity and the practice of their application, necessary for technicians and installers who are associated with the maintenance and repair of refrigerators, heating and air conditioning devices. This textbook, combining theoretical foundations with practical questions, is designed for vocational students, as well as workers who are engaged in technical services and want to improve their skills.