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Why is My Furnace Making a Squealing Noise All Day?

A high-pitched squeal coming from your furnace is usually the result of an issue with the blower or belt for the blower. The blower in your furnace is powered by a motor, which has bearings that can wear out because of age or overheating. Overheating is usually caused by dirt buildup or a bad capacitor in the furnace.

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