House is humming, literally
Hello everyone. I'm a new poster to this forum although I've enjoyed reading and learning from many a post here for quite a while.
I have a weird situation. Last summer, my fiance and I moved into a Fresno home built in '52. A few months ago, I noticed a humming noise in the center of the house, which would be where the furnace unit and hot water unit is. Both items are actually in separate 'closets', across from each other in a rather long hallway. It seems as though it's coming from the attic and I can definitely hear it when I press my ears against the walls of the hallway. I can also hear the noise through the vent in the master bath, a ways away. Some days I don't hear it at all. Some days I can hear it change pitch and 'waiver.' It seems that wind does not play a factor. Some days it seems slightly louder than others, but that could be my imagination. It's not loud. It's not as though company comes over someone says, 'Hey, what's up with that hum?!' However, if you mention it to somebody, they stand in the hallway, they always say, 'yeah, I hear it!'
Last night I couldn't take it anymore. So, one-by-one we switched off the circuits to see if this hum was connected---literally-- to any part of the electrical circuit. We turned everything off and the house still hummed.
Has anyone had a house hum? This is driving me crazy!!!