Hi,
Air-to-water heat pumps actually all make some noise. With the units for indoor installation it's still okay, but the split units are unfortunately a nuisance except for a few exceptions!
Well... imposition... I'm not a fan of those things, but to be fair, I want to say that my neighbor has one and you practically can't hear it. Well, we also don't live super close to each other. But noise is something else. Karsten