Central AC, or central air conditioning, is a cooling system designed to cool an entire building or home. It works by circulating cool air through a network of ducts, which distribute the air to different rooms. The system typically consists of an outdoor unit that houses the compressor and condenser, and an indoor unit that contains the evaporator coil. This type of air conditioning is efficient for larger spaces, as it maintains a consistent temperature throughout the building. Central AC systems can be controlled using a thermostat, allowing users to set their desired temperature easily. Regular maintenance is essential for optimal performance and longevity.