Abstract: A heat exchanger for an air conditioner comprises parallel fins through which air flows. A pipe system is disposed in the air flow and conducts a fluid which exchanges heat with the air flow. The pipe system includes a plurality of pipe segments extending between adjacent ones of the fins. Each fin includes a row of flow disrupting elements disposed adjacent a respective pipe segment such that an upstream end of each row is situated forwardly of an upstream side of the respective pipe segment, and a downstream end of each row is situated rearwardly of a downstream side of the respective pipe segment. Situated in the row is a flow diverting member which transfers air flow from one side of the fin to the other.