If your air conditioner is on and you hear the fan running but the air coming out is not cool, you should have a very simple issue to fix!
An air conditioner that runs but doesn’t cool may just need to be cleaned or the refrigerant may need to be recharged.
In either case it’s best to call an air-conditioning, or heating and cooling technician. Adding too much refrigerant can damage your compressor.
A simple maintenance call should fix the problem quickly.