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I'd venture a guess that your insulation isn't good enough if the compressor and fan unit was so loud it was bothering you inside. I can vaguely hear mine running (when it's super hot outside), but really the sound of the air from the vents is probably louder. In my case the unit is on the other side of the wall that's about 10 feet from me and under 2 windows.

Modern heat pumps can be under 55dB. I've had PCs louder than this.

55db is not quiet -- that would be the loudest thing in my house.

But shouldn't these things be in a basement or utility room?

It is comparable to a refrigerator or dishwasher running. The pumps have to be outside the house.

I can't hear mine though a double-glazed window.

Or a microwave.

Good fridges are about 35db when running.

The loud part of an air source heat pump is outside.

Which brand?

I can't remember, sorry.