Which condition indicates that an air conditioning system is not operating efficiently?

High humidity levels in the conditioned space indicate that the air conditioning system is not operating efficiently because one of the primary functions of an air conditioning unit is to remove moisture from the indoor air. When the system is not effectively dehumidifying the air, it can lead to discomfort and an increased load on the air conditioning system, ultimately resulting in higher energy consumption and elevated operational costs.

High humidity levels can affect indoor air quality and comfort, suggesting that the system is either undersized, mismatched, or suffering from maintenance issues such as clogged drains or dirty filters, which can impede proper airflow and moisture removal. Therefore, elevated humidity often serves as a clear indicator of inefficiency in an air conditioning system, making it a critical factor to consider when diagnosing performance issues.