What key factor is affected negatively by duct leakage?

Duct leakage primarily impacts air distribution efficiency because it allows conditioned air to escape from the duct system before reaching its intended destination. This results in an imbalance in the airflow throughout the building, leading to certain areas receiving inadequate heating or cooling, which can cause discomfort and increase energy costs.

When air leaks from the ducts, less air is delivered to the desired spaces, reducing the overall efficiency of the HVAC system. This inefficiency can also cause the system to work harder to maintain the desired temperature, potentially leading to premature wear and tear on components.

While humidity control, indoor aesthetics, and system warranties may also be affected by duct issues, they do not directly connect to the fundamental performance of the air distribution system as duct leakage does. Air distribution efficiency is critical for the HVAC system to perform optimally, ensuring that spaces are heated or cooled evenly and effectively.