The answer to 'what does central air do' is that a central air conditioning system cools and dehumidifies the air throughout an entire home. A central air unit uses a compressor, condenser, and evaporator coils to remove heat and humidity from the indoor air, then circulates the cooled, drier air through a system of ducts and vents in each room. This provides consistent, whole-home cooling and improved indoor air quality compared to window units or portable ACs.
Central air systems are more energy-efficient and offer better temperature control than individual room units. They can also integrate with a home's heating system for year-round comfort. To work properly, central air requires professional installation and regular maintenance by an HVAC technician.