Humming noise in my house? Help!

I'm not sure, but call a reputable electrician. Noise that stops when a breaker is turned off makes me nervous. I would be worried about the possibility of an electrical fire. Maybe even check the non-emergency fire department phone number and see if an inspector can check it out.

Sounds like something with a coil/transformer laminations breaking down.

Often times it's a failing ballast from a fluorescent light...but as Wilso indicates somewhere there's got to be a transformer starting to have a nervous breakdown. If it were me, I'd hire an electrician.

I had a noise that was driving me crazy.

Turns out it was the ice maker in the frig. I don't have it hooked up, but when the metal bar is in the "ON" position, it makes a noise like it's trying to empty the ice bin. I moved the bar up and it stopped.

You could have a bee hive in the wall and it only seems to disappear when you turn off the garage circuit, as well as the other suggestions mentioned above .

There is also the possibility it could be a power inverter for the garage to run higher voltage tools/machinery . Why this is near the kitchen.... ????

hows the rains down there? the weather guys make it sound like Florida is slipping out to sea.
I remember working down in the phosphate mine areas and seeing summer rainfalls 6" or more in an afternoon. If you were driving youd just pull over and listen to the radio till you could see again.

For the last 2 weeks, we're having a lot of rains, for certain...but who/whom it affects is a bit sporadic. Here, locally in North Sarasota, I've noticed more toadstools, more water collecting in a few low spots while seeing it rain daily but not all day, either. All of these symptoms are slightly higher than usual for this time of the year. when it rains a lot..we might see 2 inches in a day...but not more..and that might have been once or twice.

However, south and north of me they're seeing much more rain with more problems. For 5 days the Myakka River...south of us is at or near-flood stage. Tampa to the north is having some trouble in low lying area. However it's not that exceptional so far.

Bees maybe? Some other living source?

Bees...or a living source? Take note:

There is rarely anything big on the garage circuit (since people tend to plug in high current tools into the garage outlets). It is likely a fluorescent ballast from the garage where the sound is carrying into the house. You could test that from the light switch.

I agree and stated as such earlier.

Finally learned what that noise was - it was a roof fan (far from the garage) but connected to garage circuit. But the switch was inside the garage though.

Thank you to everybody for your answers !