On Sat, 18 Feb 2017 16:14:05 GMT, Tbu62
m 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)....

Get your affairs in order. Two guys in white suits went and got
"norminn" with a butterfly net.