human
How do I know when my air conditioning unit needs to be repaired?
assistant
You can tell if your air conditioning unit is in need of repair by observing any of the following signs: 
1. A decrease in airflow or an increase in noise from the unit.
2. An unusual smell coming from the unit.
3. Strange noises or vibrations coming from the unit.
4. The unit making a strange clicking sound.
5. The unit overheating and shutting off unexpectedly.