The answer to 'central air not cooling' is that there are several common causes, including a refrigerant leak, a problem with the compressor, a blocked or dirty air filter, or issues with the thermostat or electrical components. Symptoms may include the air coming out of the vents not feeling cold, the system running constantly without cooling the home, or the compressor not turning on at all.
Some potential solutions include checking and replacing the air filter, cleaning the condenser coils, and ensuring the thermostat is set correctly. However, many central air issues require the expertise of a professional HVAC technician, especially if the problem is with the compressor or refrigerant system. It's generally best to call a professional if you're not comfortable troubleshooting the issue yourself.