Heat pumps and sound levels: how to find the right balance

No one likes to be disturbed by sound. A constantly barking dog next door or a neighbour mowing their lawn early on a Sunday morning can quickly become frustrating.
While air sourced heat pumps are a sustainable and efficient way to regulate indoor temperatures, their sound pressure can sometimes raise concerns for homeowners and neighbours alike. The good news is that modern heat pumps are designed for silent or very quiet operation, often producing less sound than many traditional HVAC systems.
This guide explains what affects heat pump sound pressure, how modern technologies reduce it, and how proper installation helps maintain quiet, comfortable heating and cooling.

How heat pumps work and why sound levels matter

Air-source heat pumps are an efficient solution for heating and cooling your home while reducing your environmental impact.

They work by transferring heat between indoor and outdoor environments using a refrigerant. During colder months, the refrigerant absorbs heat from the outdoor air—even at low temperatures—and transfers it indoors. In summer, the process reverses: the refrigerant extracts heat from inside and releases it outdoors, cooling the home.

However, managing heat pump sound level is a common concern. By understanding factors that contribute to heat pump noise and the practical steps that reduce it, you can find the perfect balance between performance, efficiency and acoustic comfort.

Are heat pumps noisy?

Heat pumps can produce noticeable sound depending on their design, installation, and surroundings.

The acoustic level can be evaluated in two ways:

• The sound power is the total sound produced by the unit itself, independent of distance or environment.
• The sound pressure is the sound perceived at a certain distance and is usually measured between 1 and 5 metres from the unit.

Most modern heat pumps operate at sound pressure between 40 and 60 decibels (dB). A Daikin outdoor unit is usually no louder than 60 dB, just like a refrigerator or a normal conversation.

Indoor units are even quieter. They make a gentle whirring noise, measuring 30 dB at most, comparable to a garden sprinkler. Air-to-air heat pumps can reach as low as 19dB.

Heat pumps aren’t even allowed to be noisy. They are generally not permitted to exceed 65-70 dB, depending on their power. That’s the same level as your dishwasher. And, for extra peace of mind, all heat pumps must have a CE label stating their sound level.

While heat pumps offer a sustainable and energy-efficient solution for climate control, it’s important to note that improper installation or poor maintenance can lead to unwanted noise—particularly in quiet residential areas. To address this, modern heat pump systems featuring advanced technologies such as variable-speed (inverter) compressors are engineered to operate more quietly, ensuring a more comfortable and community-friendly experience for homeowners and neighbours.

What factors contribute to heat pump noise?

Primary sources of sound

Fans and compressors
The outdoor unit’s fan and compressor are the main contributors to heat pump sound. While running, the fan moves large volumes of air, and the compressor generates vibration.

Vibrations
Poorly mounted units can amplify vibrations, increasing the sound levels.

Unit design and technology

Modern heat pumps incorporate features such as:

• variable-speed (inverter) compressors
• insulated casings
• optimised fan designs

Inverter compressors are particularly effective because they adjust operation to match demand, reducing unnecessary noise during low-load periods.

Installation factors

Incorrect installation, such as placing the unit on an unstable surface, can amplify noise and vibrations. Proximity to windows or living spaces can also increase the perceived sound level.

Environmental considerations

Heat pumps installed in narrow spaces or near reflective surfaces (such as walls) may experience sound amplification, as sound waves bounce back toward the home.

How installation affects heat pump sound levels

Proper installation is one of the most effective ways to minimise heat pump noise.

Optimal unit placement

• Position the outdoor unit on a stable, level surface to prevent vibrations
• Install the unit away from windows, bedrooms, or living areas to minimise sound perception
• Avoid installing the unit in enclosed corners or narrow spaces

Use of noise-reducing accessories

• Anti-vibration rubber feet reduce vibrations and structure-borne sound
• Acoustic panels or barriers help absorb noise
• Landscaping such as hedges or fencing can also reduce sound propagation

Professional installation

DIY installations can lead to noisy operation due to improper positioning or mounting. A certified professional ensures correct positioning, vibration dampening, optimal airflow, and compliance with sound regulations.

Technologies that reduce heat pump noise

Developments in modern heat pump technology have significantly improved sound management.

• Variable-speed (inverter) compressors: These adjust operation based on real-time heating or cooling demand, reducing sound during low-load periods.
• Enhanced fan design: Improved fan blade aerodynamics reduce turbulence, resulting in quieter airflow.
• Sound insulation: High-quality insulation around compressors and casings helps contain internal noise — a standard feature on Daikin heat pumps.
• Smart controls: Smart thermostats and advanced control systems optimise operation, ensuring the device runs efficiently without unnecessary noise. Some models also include night mode, which reduces sound levels by 1–3 dBA during nighttime operation.
• Quieter brands and models: Manufacturers like Daikin have developed ultra-quiet heat pumps, with some models operating at sound pressure as low as 40-60 dB and air-to-air heat pumps just 19dB.

How to reduce noise from your heat pump

If your current heat pump is too noisy, several practical solutions can help.

Regular maintenance

• Clean the fan blades
• Remove debris around the unit
• Ensure components are well-lubricated

Install noise-reduction accessories

• Use qualitative rubber feet
• Acoustic panels as barriers
• Sound-absorbing enclosures

Ensure adequate airflow to avoid compromising performance.

Relocate the unit

If possible, move the unit to a less sensitive area of the property. This may involve additional installation costs but can drastically reduce sound disturbance.

Consider a system upgrade

If your unit is outdated, updating to a new model will not only drastically reduce the noise, it will also be cost-effective in the long term.

Balancing performance and quiet operation

Heat pumps offer highly efficient and sustainable heating and cooling. While they do produce sound, modern designs, correct installation and smart technology ensure that noise levels remain low and comfortable for residential environments.

By selecting the right system, installing it correctly and maintaining it properly, homeowners can enjoy quiet, energy-efficient comfort without disturbing their surroundings.

Key takeaways

• Most modern heat pumps operate between 40–60 dB, similar to normal conversation.
• Proper installation and vibration control are key to reducing sound.
• Inverter compressors and smart controls allow units to run more quietly at lower loads.
• Regular maintenance ensures continued quiet performance.
• Upgrading to Daikin’s latest heat pumps delivers both efficiency and acoustic comfort.

Ready to enjoy efficient comfort without unwanted noise?