How Noisy Are Heat Pumps? (What Homeowners Should Know)

As heat pumps continue to grow in popularity across the UK, one question we’re often asked at Pleasant Plumbers is: “Are heat pumps noisy?”

The short answer? No — but it depends on what you compare them to and how they’re installed.

If you're considering a switch from a traditional gas boiler to a low-carbon heating system, it’s essential to understand what to expect in terms of sound, especially if you live in a quiet neighbourhood or have close neighbours.

Here’s what homeowners in London need to know about heat pump noise levels, how they work, and how to keep them quiet.

Air source heat pumps work by extracting heat from the air outside and transferring it into your home. The main sound-generating components include:

• The outdoor fan (draws in air)
• The compressor (amplifies the heat)

This creates a low hum, similar to an air conditioning unit or modern fridge freezer. Most heat pumps operate between 40–60 decibels (dB) — about the same as a conversation or a dishwasher.

• 40 dB – Quiet conversation
• 50 dB – Modern washing machine
• 60 dB – Office background noise
• 70 dB+ – Loud vacuum cleaner (typical of older or faulty units)

Most well-installed domestic units operate at or below 50 dB, especially if installed with noise in mind.

1. Proximity to windows or bedrooms

Poorly placed outdoor units may transmit low-frequency vibration indoors if installed too close to windows, walls, or bedrooms.

2. Hard surfaces or echo zones

Walled gardens or alleyways can bounce sound back toward your home, making a quiet unit seem louder.

3. Faulty installation or cheap equipment

Budget heat pumps or poor installation can create unnecessary vibrations or higher decibel leve

• Use anti-vibration mounts
• Install away from bedrooms or neighbouring fences
• Add acoustic screening or fencing (non-reflective materials)
• Service your heat pump annually to keep components running smoothly
• Choose a reputable brand and certified installer

At Pleasant Plumbers, we install heat pumps across London with noise control in mind — meeting the Permitted Development noise limit of 42 dB at 1 metre from your neighbour’s window.

We’re happy to show you a live unit during a home survey, walk you through product specs, or recommend the quietest systems on the market.

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