Buy a heat pump today
When looking into buying an air source heat pump for your home, the question of noise is one of a number of important factors to consider. Heat pumps are generally no nosier than the flue exhaust from a gas boiler. However, they do produce some sound during operation. That said, the noise level can vary depending on factors such as the model, installation quality, and operating conditions. You’ll find that most modern heat pumps like Hive’s are designed with noise reduction in mind, featuring improved compressor technology and sound-dampening materials.
Want to know more about air source heat pumps?
What does an air source heat pump sound like?
An air source heat pump's sound is often described as a low hum or gentle whoosh, similar to a fridge or air conditioning unit. The noise comes primarily from two sources: the compressor inside the unit and the fan that moves air across the heat exchanger. During normal operation, you might hear a soft whirring sound as the fan spins, and occasional clicks or gentle thuds as the compressor cycles on and off.
The exact sound level can vary, but most modern air source heat pumps operate at around 40-60 decibels from a distance of one metre. To put this in perspective, it's quieter than normal conversation (60 dB) and comparable to the sound of a fridge (30 - 50 dB). The noise is also typically less noticeable indoors, especially in well-insulated homes so you shouldn’t experience any huge disruption.
What does a ground source heat pump sound like?
If you’re conscious about the noise of an air source heat pump, ground source heat pumps are generally quieter. This is because the main noise-producing components - the compressor and circulation pumps - are located inside the building, often in a utility room or basement. The absence of an external fan, which is necessary in air source units, means that noise is reduced even further.
When operating, a ground source heat pump typically produces a low, consistent hum. This sound is usually around 35-45 decibels, which is comparable to a quiet library or a soft whisper. Some models can be even quieter, with noise levels as low as 30 decibels.
It's worth noting that while the heat pump itself is very quiet, you might hear some low-level noise from the heated water circulating through pipes and radiators. However, this is generally no louder than a traditional central heating system.
Are heat pumps quieter than boilers?
In general, heat pumps are quieter than traditional gas boilers. Modern condensing boilers typically operate at around 40-50 decibels, which is similar to or slightly louder than most heat pumps. However, the nature of the sound differs. Boilers often produce a more noticeable ignition sound when firing up, followed by a consistent background noise. Heat pumps, on the other hand, tend to produce a steadier, low-level hum.
It's worth noting that the perceived noise can vary depending on the installation location and the specifics of your home. A well-installed heat pump should be barely noticeable from inside your house, especially in a well-insulated property.
Are air source heat pumps louder in the winter?
Heat pumps can be slightly noisier during winter months due to increased workload. As temperatures drop, air source units may run more frequently and engage in defrost cycles, causing occasional changes in fan speed and subtle tapping or dripping sounds. Compressors might cycle more often to meet higher heating demands, potentially increasing overall noise levels.
Are there any regulations for heat pump noise?
Yes, there are regulations in place to manage noise from heat pumps and other mechanical equipment. In the UK, these fall under planning permission and building regulations. The current guidelines state that the noise level should not be exceeded and experienced by the nearest neighbouring property. That said, to guarantee that you’re adhering to the regulations in your area, it’s recommended that you consult with your local authorities.
Where is the best place to install a heat pump to reduce noise?
The ideal location for a heat pump installation should aim to balance efficiency with noise reduction. Generally, it's best to place the outdoor unit of an air source heat pump:
- Away from bedrooms and living areas, both in your home and neighbouring properties
- On a solid, level surface to minimise vibrations
- With some space around it for good air circulation (typically at least 30cm on all sides)
- Away from corners or enclosed spaces where sound can echo and amplify
- Ideally, on the side of the house rather than the front or back, to reduce impact on neighbours, especially if you live in a terrace house
For ground source heat pumps, the internal unit should be placed in a utility room or garage, if possible, away from living spaces. The external ground loop doesn't produce noise, so its location is more about efficiency than sound reduction. An expert should advise you on the best place to install a heat pump in your home.
Need help with heat pump installation?
Can you reduce heat pump noise?
While the hum of a heat pump is not usually noticeable and is likely to blend into background noise, there are several strategies that you can try to reduce heat pump noise. These include:
Ensure your home is properly insulated
Good insulation not only improves your heat pump's efficiency but can also help reduce noise. Well-insulated walls and windows act as sound barriers, minimising the amount of outdoor noise that penetrates your home. This is particularly beneficial for air source heat pumps, where the outdoor unit produces the most noise. Not only that, but proper insulation reduces how much you rely on your heat pump, potentially reducing its overall noise output and running costs.
Don't overwork your heat pump
An overworked heat pump can be noisier than one operating within its optimal range. You can also use smart thermostats to maintain steady temperatures rather than frequently adjusting settings. It’s also recommended that you keep doors and windows closed when the heat pump is running to maintain efficiency and reduce strain on the system.
Ensure your heat pump is well-maintained
Regular maintenance is essential for quiet heat pump operation. If you are concerned that your heat pump is making too much noise, make sure to schedule a professional check-up to ensure all components are working correctly. You should also clean or replace air filters monthly to maintain airflow and prevent the system from working harder than necessary, as well as keep the outdoor unit clear of debris, leaves and snow. Listen for any unusual noises, which could indicate a problem needing attention.
Get a heat pump cover
Another possible solution is to use a purpose-built heat pump cover. These covers are designed to allow proper airflow while dampening sound. Look for covers made from sound-absorbing materials that won't interfere with the heat pump's operation. Some covers can even reduce noise by up to 7 decibels, which is a noticeable difference. However, ensure any cover you choose is compatible with your specific heat pump model and doesn't void the warranty.
Thinking about getting a heat pump?
As we move towards more sustainable heating solutions, the benefits of heat pumps - including their energy efficiency and reduced carbon footprint - often outweigh any minor noise concerns. That said, with proper installation and maintenance, the sound output can be minimised to the point where it's barely noticeable in day-to-day life.
If you're considering buying a heat pump, it's worth discussing noise reduction strategies with your installer. They can help you choose the right unit and location to ensure quiet operation. Remember, a well-installed and maintained heat pump should provide comfortable, efficient heating without causing disturbance to you or your neighbours.