On Saturday, February 18, 2017 at 11:14:08 AM UTC-5, Tbu62 wrote:
replying to norminn, Tbu62 wrote:
I have the same thing in 2 different homes. A very subtle 60 Hertz hum that
drives me crazy. It's noticeable everywhere inside both houses. I strongly
suspect the structures are resonating the vibrations from the surrounding
electrical grid. (why not, flowing energy creates resonance in the wires and
pipes)....

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There have been mysterious hums of unknown origin at many places in
the USA over the years. TAOS, NM or Kokomo, Indiana are two of them.
About 15 years ago, I heard it here in NJ and it's been reported in
other nearby towns too. Best described as like a very faint rumble
similar to an idling diesel. When I first heard it, I thought it was
in the house. I turned off the main breaker, finally concluded it was
coming from something outside the house. Sometimes it can be heard
outside, but it generally is more noticeable or only inside a structure.
It's mostly heard at night too, rather than the day.

What it is, whether everyone that hears it is hearing the same thing,
no one knows. If you google for taos hum, kokomo hum, the hum, etc
you'll find info. Here I heard it off and on for several years, but
then it went away and I have not heard it again in probably 10 years.