It's hard to believe, but winter is just around the corner, andwith it comes a new wave of heating, ventilation andair-conditioning claims.

A common failure that aging HVAC systems suffer in fall andwinter months is the breakdown of the heat exchanger because ofthermal fatigue.

To some degree, all metals that are repeatedly heated and cooledare subject to thermal fatigue, a cyclic stress that weakens themetal to an eventual point of failure. The degree to which metalsare affected by thermal fatigue includes such stressors as: Howoften the metal heats and cools, how quickly the temperature of themetal changes, and the composition of the metal.

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