31/01/26
Getting an angry note from the neighbour about a noisy unit is something many homeowners worry about—but the reality is that modern systems are a lot quieter than people expect.
So, are heat pumps noisy? In most cases, no. Modern heat pumps use advanced variable-speed compressors that keep sound levels low, steady, and far less intrusive than older models.
If a unit is noisy, it’s usually a sign of poor installation, incorrect sizing, or that it’s due for a service rather than a fault with the technology itself.
According to the technical team at Oxygen Air, most modern units operate between 30–60 decibels (dB).
To put that into context:
So when people ask are heat pumps noisy, the honest answer is that they’re typically no louder than background household sound.
Inside the home, most systems are designed to be “whisper quiet”, while the outdoor unit produces a low, consistent hum rather than disruptive noise.
It’s also worth noting that sound levels can increase slightly when the unit first starts up or when working harder to reach temperature—but this usually settles quickly once it stabilises.
A major factor in whether people think are heat pumps noisy is actually installation quality.
Poor placement or fitting can amplify sound unnecessarily. To avoid this, outdoor units should:
Oxygen Air often finds that so-called “noisy heat pumps” are actually just poorly installed systems. Correct installation makes a significant difference in perceived sound levels.
Where your outdoor unit sits can dramatically change how loud it feels.
If it’s placed:
…sound can bounce or carry further than expected.
This is why professional installers carefully plan placement—not just for performance, but for comfort and neighbour-friendly operation.
So again, if you’re wondering are heat pumps noisy, the real answer often depends on where and how they’re installed.
Heat pump enclosures are becoming more common in New Zealand homes.
They can:
However, airflow is critical. Any enclosure must be designed correctly to avoid restricting ventilation or impacting performance.
Adding sound-dampening materials is possible, but should always be done carefully and professionally to avoid overheating or warranty issues.
Heat pumps can make a range of normal operational sounds, including:
These are generally normal.
But if you notice:
Then it’s likely a maintenance issue such as worn bearings or debris build-up.
A professional service from a team like Oxygen Air will usually resolve these issues by cleaning components, checking refrigerant levels, and ensuring everything is running smoothly and quietly.
While most concerns around are heat pumps noisy focus on outdoor units, indoor units are also designed for low sound levels.
Noise indoors can usually be reduced by:
In most cases, indoor units are quieter than typical household background noise—especially compared to TVs, appliances, or even everyday conversation.
So, are heat pumps noisy? In modern homes, not really.
Today’s systems are designed to be efficient, discreet, and quiet—especially when correctly installed and maintained. Most noise concerns come down to placement, installation quality, or lack of servicing rather than the technology itself.
If you are noticing unusual sound levels, it’s worth getting a professional check. With the right setup, your system should quietly do its job in the background—without upsetting you, your household, or your neighbours.
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