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Where are you that's so quiet out of interest?
Crouch End.
You can look on a map to see the terrain, but in essence there's a steep hill with a bowl shallow in it and everything North of Stroud Green and South of Alexandra Palace is in this shallow and the hill is hard rock... meaning that the land reflects away the noise of London, the big roads all go around the hill, and the hard rock means there are no tube stations here... it's light suburbia, quiet roads and dead quiet all the time.
This is a really good point. No ASHP here and we put our boiler in a cupboard outside, but the boiler, pumps etc. send noise down the pipes which run down one side of our flat. There are two walls between them and our bedroom but they are surprisingly loud. Not a big deal but for our next place (which I want to be somewhere very quiet) I will think carefully about the location of utilities/services, how much noise they make and how to stop it spreading around the house.
Where are you that's so quiet out of interest?