Based on the Air Conditioning Institute Curriculum Guide, this book provides practical information to supplement and advance skills of the entry-level technician. It focuses on air conditioning systems and the components that make up these systems, while emphasizing information that will be useful to the service technician. The material presented here stresses the competency-based educational approach, preparing readers to exhibit learned skills in several different ways, and put information into practice so that it is useful and maintained. Chapter topics include extensive information on charging procedures; electrical and refrigerant-side troubleshooting; safety and the refrigeration cycle; preventive maintenance; and industry certification. A useful source of knowledge for entry-level technicians and experienced professionals in the air conditioning field.