AnomalyConstant, lowvfrequency sound, similar noise to a tank water pump or a small transformer rigged to one house such as a rural electricity supply to a property. I've looked around the neighbourhood and listened for possible causes. New transformers on street poles, other reverse cycle airconditioners or pumps running. Have managed to find two water leaks re: mains pressure changes: Yet to be fixed. Turned off the mains electricity - no luck. Turning off the mains water is slightly more difficult but shall be done to see if it could be responisible.
Mildura VIC 3500 Australia · 2020-09-19 · from the WORLDHUMMAP archive
An account in Mildura VIC 3500 Australia
What they reported
First noticed: 2020
Pitch: Approx. 130 Hz Sine waveform, Vol ~ 75%
Loudest: During the night
Where: Equal indoors and outdoors
Symptoms: Insomnia, Anxiety
Changes with weather: No. Rain can drown out the sound, while it lasts.
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This is a Hum report from Dr Glen MacPherson's World Hum Map, an open, worldwide record of people who hear an unexplained low-frequency hum. Reproduced with permission and with thanks; the project is at thehum.info. We remove anything on request. Location shown is approximate.