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What can cause a humming noise in the attic when the furnace is on?

In: Home & Garden, Furnaces [Edit categories]

Answer:

If the furnace itself is in the attic, the humming is likely caused by electrical components in the furnace--most likely, the blower motor, or else a transformer or relay coil. If the furnace is located elsewhere, the humming may be caused by a damper motor or possibly the air movement itself vibrating a damper or some sheet metal.

The HVAC Veteran

First answer by ID3468337120. Last edit by ID3468337120. Question popularity: 1 [recommend question].

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