Jabba wrote:
Just moved into a new place. Noticed a sound that reminds me of
somebody playing a single note on a wind instrument over and over ad
nauseum. The noise is intermittent and always sounds the same. I think
some people refer to it as "white noise".

It's not "white noise". White noise has energy spread across the
specturm, not just a single note.

Is this a single family or multi-family dwelling?

Try turning off various circuit breakers and see if you can make it go
away. That will give you a clue.