Ground heat pump - how loud is the device?

Hello,
we will soon start the renovation of our half-timbered house.
The room with the heat pump (make/model is not yet determined) will be directly below the bedroom, and now we are thinking about the noise level of the ground-source heat pump.
What kind of sounds does such a device make? Humming, bubbling, whistling?
The floor between the two rooms will be completely rebuilt (at least insertion boards below and floorboards above, possibly additional sound insulation in between).
Is noise protection necessary and what should it look like?

Best regards
Egon

Pay attention to a model that is as quiet as possible. The aspect is definitely not insignificant. Alternatively, lock the operation at night.

Okay, it is not comparable. Since we have a new building with a concrete ceiling as well as KS interior walls. I simply take the room door to the technical room as a comparison. Inside, there is a water storage/ brine pump (Waterkotte), controlled residential ventilation (Vallox), and a server cabinet with a rather loud 48-port PoE switch. When you stand inside the room, it is quite a backdrop. As soon as the door is closed, you can't hear anything directly outside the door anymore.

What noises does such a thing make? Buzzing, bubbling, whistling?

Buzzing: yes.
Bubbling or whistling: hopefully not.

Is noise protection necessary and what should it look like?

Noise perception is extremely subjective. I hear a dripping faucet and don’t notice when a plane flies over my sleeping area. For my wife, it is the other way around. She doesn’t notice the dripping but cannot get over the plane. In almost every show home in Frechen, Wuppertal, and Kaarst, buzzing units disturbed me, which my wife did not perceive.

Possible measures:

[*
Choose a quiet device and know that dB ratings are not everything.
[*]Structure-borne sound:
[LIST]
[*]With a floor of very high mass: attach the device (fasten, concentrate the weight on a minimal area...)
[*]With a floor of low mass: decouple the device (buffers, dampers...)
[*]Decouple the floor on which the device stands from walls
[*]Do not attach the device to any wall


[*]Sound transmission through the air:


[*]Depending on the location of the device, provide a door with increased sound insulation.
[*]Walls made of sound-absorbing or sound-absorptive material