Air Systems Cleaning Specialist (ASCS) Practice Exam 2025 - Free ASCS Practice Questions and Study Guide

The function of the cooling coil in an air conditioning system is primarily dehumidification. As air passes over the coil, which is chilled to a low temperature, the moisture in the air condenses on the coil's surface. This process removes water vapor from the air, thereby reducing the humidity levels in the indoor environment.

This is crucial for maintaining comfort, as high humidity can lead to a feeling of mugginess and can promote the growth of mold and mildew. The removal of moisture not only improves comfort levels but also enhances the efficiency of cooling systems.

The other options do not accurately describe the function of the cooling coil. Humidification refers to adding moisture to the air, which is the opposite of what occurs with a cooling coil. Stratification relates to layers of air with different temperatures or densities, and destratification involves mixing those layers to provide a uniform temperature. Neither of these concepts is directly related to the moisture removal process that occurs in a cooling coil.