The answer to 'central air blowing cold air' is that the most common causes are a refrigerant leak, a problem with the compressor, or a blocked or dirty air filter. Symptoms include the air coming out of the vents feeling colder than normal, the unit running constantly, and higher than usual energy bills. Solutions may include repairing refrigerant leaks, replacing the compressor, or simply changing the air filter. However, it's generally best to call a professional HVAC technician to diagnose and fix the problem, as they have the expertise and tools to properly maintain and repair central air conditioning systems.
Central air conditioning systems are complex, and attempting DIY repairs can be dangerous if you don't have the proper training and equipment. A professional HVAC technician will be able to quickly identify the root cause of the issue and make the necessary repairs to get your system running efficiently and safely again.