My downstairs is heated by a cold weather heat pump, my upstairs by a furnace. In extreme cold snaps, I noticed the heat pump sound when I’m directly on the other side of the wall to it. But I can still easily tune it out and sleep with it going full blast.
Do you have a heat pump? Is it noisy?
Riffing off the earlier post about heat pumps in cold weather (lemmy.world/post/10270502), how much noise does your heat pump make?...