What type of moisture condition affects the performance of a filter drier?

The correct choice highlights that the presence of moisture in a refrigeration or air conditioning system can significantly impact the performance of a filter drier. Filter driers are designed to remove moisture, contaminants, and acid from the refrigerant, ensuring proper operation of the system.

When moisture enters the system, it can lead to various issues such as the formation of ice, which can block the flow of refrigerant and decrease efficiency. This situation can create a detrimental cycle where the filter drier becomes overwhelmed, eventually failing to protect the system effectively. Therefore, understanding that moisture will indeed affect the filter drier's performance is crucial for the maintenance and longevity of HVAC systems.

Recognizing the inevitability of moisture entry into the system underscores the importance of regular checks and maintenance to prevent operational failures, rather than being conditional or uncertain about its impact.