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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
What else can I help you with?
What causes a brief humming noise after initial acceleration?
Certain types of tires may cause a brief humming noise after your initial acceleration. The transmission may also cause a brief humming noise.
What would cause humming noise in front end of 99 Mercury Sable?
1999 Mercury front and humming noises can because by several things. Tire noises are the most common cause. A tire that is not wearing properly can cause a humming noise.
What is the cause of humming noise while driving?
Bad wheel bearing
Why does your 2002 Saturn Vue v6 3.0 have a humming noise in the mornings it goes away after a few miles?
The humming noise can be in your exhaust system. The exhaust will heat up and seal the area where there can be a leak. The hot exhaust will cause the noise to decrease.
Can a tire thread design cause a humming noise eg velocity r-max?
Yes.
What could be causing the vibrating humming noise in my house?
The vibrating humming noise in your house could be caused by a variety of factors, such as loose pipes, electrical issues, or a malfunctioning appliance. It is important to investigate the source of the noise to determine the exact cause and address it accordingly.
What would cause a computer tower to make a surging noise rather than a constant humming noise as it usually does?
A computer tower may make a surging noise rather than a constant humming noise if the case's screws are not properly tightened. Another reason for such a surging noise is the imminent failure of a fan.
What would cause a humming noise after starting a 1992 Buick Century with 55000 miles that comes from the area of the power steering but it has enough fluid?
when the pump is going out it will make a humming noise from the bearings even if the resivore is full.
Humming noise in your speakers when at idle and when you accelerate it gets louder?
the humming noise is coming from a bad ground on you stereo
What is the cause of a humming noise when turning the steering wheel of a Honda Prelude?
Anytime I've ever heard a humming noise when turning the steering wheel on any vehicle,It has always been due to low power steering fluid
What could be the cause of a humming noise from the engine of a 2002 Toyota Corolla?
There could be a humming noise from the engine of a 2002 Toyota Corolla because of low oil or a fouled spark plug. It can also indicate a more serious problem.
Why does the engine make a humming noise near the alternator after you shut down the VW 2001 Beetle 1.8T?
Your engine might make a humming noise near the alternator after you shut it down because the fan is still running or because the fuel pump is shutting down. Another cause for the humming noise could be the AC motor turning off.
