Mystery Intermittent Noise in New House
A friend recently built her 900sf home in New Mexico, zone 5b. It is 2×6 frame, blown in cellulose walls and attic, concrete slab with 32″ foundation. She called a few days ago and told me about an intermittent hum that sounded mechanical, (like a pump) but she couldn’t locate the point of origin. Her mechanical contractor (very competent) couldn’t find anything. My advice was to turn off the main breaker when the noise was happening to see if that would stop it, and then turn on one breaker at a time to isolate the circuit, and then do the unplugs, one at a time, to pinpoint. But the noise continued when the power to the house was shut off. She has radiant heat (open loop) powered with by a propane powered Navien boiler and a pellet stove. Her water line is from city water, run in plastic and her takeoff is about 200 feet away and the run from there to her house is pex. She is on grid, and power lines are run underground. Her septic is a split system, gravity fed. The noise seems to come mostly in the morning or at night – not so much in the afternoon. Does anyone have an idea as to where this sound is coming from or how to trouble shoot it? I am wondering now if it is a hum or vibration from source external to the house that is being transmitted through conduit or pipe.
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