Anomalysounds like an idling aircraft engine I've moved houses within the same postal code, to be much closer to my ageing/frail parents. There was a theory that the noise at the old place (also a detached house, similar construction built in the same time period - mid-1970s) could have been caused by traffic lights or an old electricity meter. There's neither at the new address. The heating source at the old place was oil tanks in the basement, the new address had a new gas mains and new everything else installed...
Germany. Hamburg, 22559 · 2019-03-15 · from the WORLDHUMMAP archive
An account in Germany. Hamburg, 22559
What they reported
First noticed: 2012
Pitch: 45 Hertz sine matched the noise best
Loudest: Equal night and day
Where: Equal indoors and outdoors
Symptoms: Headache, Insomnia, Nausea
Changes with weather: no
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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.