Which method can be used to dehumidify an air duct?

Dehumidifying an air duct involves removing moisture from the air. One effective method to achieve this is by cooling the air to its dew point. When air is cooled, its ability to hold moisture decreases. When the air temperature drops to the dew point, water vapor condenses into liquid water, effectively removing humidity from the air. This process is essential in air conditioning systems, where reducing humidity not only improves comfort but also prevents mold growth and other moisture-related issues.

Heating the air, circulating warm air, or adding humidity would not effectively reduce the moisture content. Heating or circulating warm air can actually increase the relative humidity of the space if no moisture is removed, while adding humidity directly contradicts the goal of dehumidification.