What is a common indicator that an air conditioning unit requires service?

An air conditioning unit requiring service can often be indicated by unusual noises or a reduced cooling capability. When an AC system is functioning properly, it typically operates quietly and provides consistent cooling. If there are strange sounds, such as grinding, squealing, or rattling, these can signal mechanical issues that need attention. Additionally, if the unit fails to adequately cool a space, this might suggest problems such as low refrigerant levels, a clogged filter, or issues with the compressor.

Issues such as unchanged energy bills, consistent airflow without fluctuations, and stable temperature control do not typically highlight problems. For example, unchanged energy bills might suggest the system is operating efficiently, while consistent airflow and stable temperature control indicate that the unit is functioning properly. Thus, unusual noises and a decrease in cooling effectiveness are key signs that indicate the need for maintenance or repairs.