The answer to 'why is my central air blowing hot air' is that there are several common causes, including a refrigerant leak, a problem with the compressor, or a clogged air filter. If your central air is blowing hot air instead of cool air, it usually indicates an issue with the cooling system that requires professional diagnosis and repair.
Some common symptoms of a central air system blowing hot air include the air not feeling as cold as it should, the system running constantly without cooling the home, or the outside unit making unusual noises. The solutions can vary depending on the root cause, but may involve recharging the refrigerant, replacing the compressor, or cleaning or replacing the air filter.