ESCO Air Conditioning Practice Exam 2026 – The All-in-One Guide to Exam Success!

A symptom of a dirty condenser coil is higher indoor humidity levels. When the condenser coil accumulates dirt and debris, it impairs the coil's ability to dissipate heat effectively. As a result, the system may struggle to remove sufficient moisture from the air, leading to increased humidity levels indoors.

This situation occurs because the refrigerant in the system requires proper heat exchange to condense and remove moisture efficiently. A dirty coil acts as an insulator, reducing heat transfer and causing the system to work harder, which can prevent it from adequately dehumidifying the air, leading to uncomfortable humidity levels inside the building.

In contrast, options such as increased efficiency, quieter operation, and improved airflow are typically associated with clean and well-maintained components. A dirty condenser coil usually results in reduced efficiency, noisier operation due to the strain on the system, and diminished airflow as the system struggles to expel heat effectively.