Higher humidity levels correlate with what effect across the evaporator coil?

Higher humidity levels correlate with a less temperature difference across the evaporator coil because as humidity increases, the moisture in the air affects how efficiently the coil can absorb heat. In humid conditions, water vapor in the air requires additional energy to condense, which means that the evaporator coil may struggle to remove heat effectively.

The result is a smaller temperature differential between the air entering and exiting the coil. When humidity is high, the evaporator's ability to lower the air temperature is compromised because some of the cooling effect is utilized in dehumidifying the air, rather than simply cooling it. This relationship highlights the interplay between humidity and temperature difference in HVAC systems, demonstrating how increased moisture can diminish cooling performance.

In contrast, increased airflow typically would not directly relate to humidity, and higher energy consumption is more a function of system design and usage rather than humidity alone. A lower refrigerant charge could indeed affect system performance, but it is not a direct consequence of higher humidity levels.