The letters “H” and “C” in the context of an automobile commonly refer to the temperature settings on the vehicle’s climate control system. “H” signifies hot, indicating that the system will generate warm air for heating the passenger compartment. “C” represents cold, signaling that the system will produce cooled air for air conditioning. For example, rotating the temperature dial towards “H” will increase the warmth of the airflow, whereas turning it toward “C” will lower the temperature, initiating air conditioning.
Understanding these temperature designations is fundamental for maintaining a comfortable and safe driving environment. Proper use of the heating and cooling systems can prevent driver fatigue caused by excessive heat or cold, as well as ensure optimal visibility by defogging windows. Historically, these markings have been consistently used across a wide range of vehicle manufacturers, establishing a universal and easily understood interface for climate control operation.