human
How do I know when it's time to replace my air conditioning unit?
assistant
The best way to tell if your air conditioner needs to be replaced is to look at the age of your current unit. Generally, most air conditioners last around 10-15 years before they need to be replaced. However, you can also check the efficiency rating on the unit and compare it to similar models in order to determine if it's still working efficiently. If the unit has been running for a while and its efficiency rating hasn't improved much over time, it may be time to consider replacing it.