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Humming can come from many things. But you need to put on your super ears and thinking cap to figure it out.
First off, does the sound get louder or quite when its windy? Is it louder at night or during the day?
Do you have vinyl siding on the house? Do you have vinyl vents on the overhangs on the house? Do you have a windmill type attic vent that uses no power to operate? Or perhaps a solar powered roof vent with battery system?
Humming noise oftentimes comes from a reed like action of the siding, or overhang soffits when even the slightest breeze occurs. Even house wrap that is hanging down within the attic can cause this occurrence. Check any vents on the house. The flappers if they get stuck can vibrate even with the slightest breeze.
Try opening or closing windows. Doors. Does that make a difference?
You can take a box fan and put it into a window. Close all the rest of the windows in the home. With the fan running and blowing out, Does the noise change? Turn it around and run it again. What happens then? If the noise goes away we now know that it could have something to do with air vents.
If its a reed like action making the sound it should change dependent on air flow through the house. So by changing the air flow the noise would change as well.
Do you have a fireplace or wood stove? The damper or the chimney cap can cause noise if air flow through it and the item is loose.
Often times the less the noise is heard during the evening tells me that perhaps you may have a large insect nest somewhere within the walls? Perhaps a honey bee nest? Although they are pretty much inactive during the night, they still make a buzzing sound most of the time.
A real large carpenter ant issue can also make this noise as well.
How close are you to your neighbors? Perhaps the noise is coming from their home. What about the transformer that is on the outside pole or sitting on the ground? If these hum and you have underground pipes to the service connection the noise can travel through the pipe.
Do you seem to hear it more in bathrooms or near kitchen area? Noise from pipes can occur for several reasons.
How long has this been going on? Oftentimes the noise seems louder at night because of the outside being more quite. So its difficult to determine if its louder at night then compared to the day.
You simply need to walk around, put your ear and your hands on every wall and or floor in an attempt to determine where the vibration is coming from. Once you isolate the loudest area then simply focus on that area and think about something that could cause a vibration action that could cause the noise.
Remember the house acts as a sounding board, much like a guitar uses the hollow body to amplify the sound. The same thing is happening in your home. So do not expect some large item to be causing this, its typically something real small and has to do with air movement.