As air-conditioning equipment ages, its ability to maintain adequate space temperatures and humidity levels declines.1,2,3 Often, the culprit is reduced coil heat-transfer effectiveness, or the ability of air-handling-unit (AHU) cooling coils to remove heat from air. Evidence shows this drop in performance can occur within five years of startup. Typically, reduced heat-transfer effectiveness results from the buildup of contaminants on coil surfaces. This accumulation of organic material ...

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