ᐅ Ground Source Heat Pump – How Noisy Is the Unit?

Hello,
we are about to start renovating our timber-framed house.
The room housing the ground-source heat pump (brand/model not yet decided) will be located directly below the bedroom, and we are now considering the noise level of the heat pump.
What kind of sounds does such a system typically produce? Humming, bubbling, whistling?
The floor between the two rooms will be completely rebuilt (at least with joist boards below and floorboards above, possibly with sound insulation in between).
Is soundproofing necessary, and if so, what would be the best approach?

Good luck
Egon der 3

Choose a model that operates as quietly as possible. This aspect is definitely not insignificant. Alternatively, consider restricting operation during nighttime hours.

Okay, it’s not really comparable since we have a new building with a concrete ceiling and calcium silicate interior walls. As a reference, I’ll just use the door to the utility room. Inside, there is a water storage tank/brine pump, controlled ventilation system, and a server cabinet with a fairly loud 48-port PoE switch. When you’re inside the room, it’s quite noticeable, but as soon as the door is closed, you can’t hear anything outside the door.

Egon der 3. schrieb:

What kind of noises does such a unit make? Hum, bubbling, whistling?

Humming: yes.
Bubbling or whistling: hopefully not.

Egon der 3. schrieb:

Is soundproofing necessary, and what should it look like?

Noise sensitivity is highly subjective. I can hear a dripping faucet but don’t notice when a plane flies over my sleeping area. For my wife, it’s the opposite: she doesn’t hear the dripping but is bothered by the plane noise. I was disturbed by humming units in almost every show home in Frechen, Wuppertal, and Kaarst, which my wife didn’t notice.

Possible measures:

• Choose a quiet unit and keep in mind that decibel ratings don’t tell the whole story.
• Structure-borne noise:
• For floors with very high mass: couple the unit firmly (secure it, concentrate weight on a minimal area, etc.)
• For floors with low mass: isolate the unit (use buffers, dampers, etc.)
• Decouple the floor on which the unit stands from the walls
• Do not attach the unit directly to any wall
• Airborne noise transmission:
• Depending on the unit’s location, provide a door with enhanced soundproofing
• Use walls made from sound-absorbing or sound-damping materials