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Why is my CPAP so loud?
In the vast majority of cases the noise does not come from the machine but from a leaking mask. A high-pitched hiss means a leak, a gurgling sound means condensation in the tubing, and a duller hum comes from the motor or a clogged filter. The type of sound tells you where to look.
A modern CPAP machine is designed to be near-silent. The ResMed AirSense 11 AutoSet operates at just 27 dBA - barely above a whisper. If your CPAP is noisy at night, there is an identifiable reason. This guide helps you diagnose the source and fix it quickly.
1. Mask Leaks - The Most Common Cause
This is the first place to look. Our dedicated guide covers every cause of CPAP mask leaking and the fit test to run on your device.
A leaking mask produces a characteristic hissing or rushing air sound. This is the number one cause of noisy CPAP therapy.
Why is my mask leaking?
- Worn cushion: silicone degraded by skin oils no longer seals properly. Replace every 3 to 6 months.
- Poor fit: the mask is too loose or too tight. Adjust the straps - over-tightening also causes leaks by deforming the cushion.
- Sleep position: side sleeping can push the mask against the pillow and cause a leak.
- Movement during sleep: the mask can shift. Try adjusting the headgear so it stays in place.
- Stretched headgear: straps lose elasticity over time and no longer hold the mask firmly.
- Cream or oil on the face: moisturisers applied before bed prevent the cushion from adhering.
Immediate solutions
- Check your cushion is clean - a clean cushion adheres better to the skin.
- Re-fit your mask: loosen first, then tighten gradually to find the right balance.
- If leaks persist, replace the cushion.
Find the spare parts for your mask in our shop.
2. Condensation in the Tube (Rainout)
The setting responsible is humidification. See setting humidification and tube temperature.
Condensation forms when warm, humid air from the humidifier cools in the tube before reaching the mask. That creates droplets which produce an unpleasant gurgling or spitting noise. The phenomenon is known as "rainout".
Solutions against condensation
- Heated tube: the ClimateLineAir 11 (for AirSense 11) maintains constant air temperature throughout the tube, eliminating condensation. It is the most effective solution.
- Reduce the humidifier temperature: lower the humidifier setting by one step to produce less vapour.
- Insulate the tube: wrap the tube in a sock or buy a purpose-made insulating sleeve to reduce the temperature gap.
- Keep the bedroom at a moderate temperature: the colder the room, the more condensation forms.
- Position the device lower than your head: if drops form, they fall back towards the device instead of your mask.
3. Dirty Filter
A saturated filter makes the motor strain. See replacing the air filter.
A clogged filter restricts airflow and forces the motor to work harder, generating unusually loud noise. The ResMed manual asks you to check the filter and replace it every six months, and more often if it is blocked or holed. In a dusty environment, with pets or during building work, that interval shortens sharply.
4. Inappropriate Pressure
A CPAP pressure that is too low leads to residual apneas and snoring - which creates noise. A pressure that is too high can cause air swallowing and force you to exhale against too much resistance, generating turbulence.
If you suspect a pressure problem, discuss it with your doctor or review your data through the myAir app or the OSCAR software. Never change pressure settings without medical advice.
5. Mechanical Device Noise
If the noise clearly comes from the machine itself (humming, abnormal vibration, grinding), check:
- That the device sits on a stable, flat surface
- That the filter is in place and correctly inserted
- That the tube is correctly connected (no micro-leak at the connector)
- That the inside of the device is not clogged with dust
If the mechanical noise persists after those checks, the device may need servicing or replacement. Contact your supplier.
6. Mask Noise by Type
Some ResMed masks use a quiet air diffusion technology. Our page on the QuietAir system explains what it actually changes.
Full-face masks (AirFit F20, F40)
Full-face masks have a larger contact area and therefore more leak risk. Make sure the cushion is clean and correctly positioned. The AirFit F40 with its silicone foam cushions is often more comfortable and less prone to leaks.
Nasal masks (AirFit N20)
The AirFit N20 covers the nose only. If you open your mouth during sleep, air escapes through the mouth and creates noise. Use a chin strap or switch to a full-face mask.
Nasal pillow masks (AirFit P10)
The AirFit P10 is one of the quietest masks on the market. Leaks usually come from a badly positioned or worn nasal pillow.
Summary: diagnosis in 5 steps
- Cushion: clean? worn? correctly positioned?
- Tube: condensation? correctly connected?
- Filter: clean and in place?
- Pressure: appropriate for your therapy?
- Device: abnormal mechanical noise?
Browse our full range of CPAP accessories and find the quietest devices on the market, including the AirSense 11 AutoSet (27 dBA).
Frequently asked questions about CPAP noise
A modern CPAP runs between 25 and 30 dBA in normal use, less than a whisper. The ResMed AirSense 11 AutoSet is rated around 27 dBA. Older or poorly maintained devices can climb to 35 dBA or more, which becomes audible. Above 35 dBA there is almost always an identifiable cause: clogged filter, mask leak or mechanical fault.
A CPAP that becomes noisy over time almost always has a simple mechanical cause: saturated filter forcing the motor, worn mask cushion leaking, loose tube or internal condensation. Check these points in order. If noise persists after a thorough clean and replacement of consumables, the device may need motor service. Then contact the manufacturer aftersales or your retailer.
Simple method: turn the device off and listen. If you hear nothing, the noise comes from the pressurised circuit. Then switch the CPAP on without wearing the mask, blocking the air outlet with your hand. If the noise disappears, the source is the mask (leak, cushion whistling). If it persists, look at the filter, tube or device. Nine times out of ten, it's a mask leak.
Yes, it's one of the most common causes. A clogged filter partially blocks airflow. The motor compensates by running faster, which produces an audible hum. The ResMed manual asks you to replace it at least every six months, and more often if it is blocked, holed or visibly loaded. With pets, in a dusty area or during building work, expect much shorter: it is the state of the filter that decides, not the calendar. It's the cheapest and most effective maintenance step to restore silent operation.
Yes. When humid air warmed by the humidifier cools in the tube, droplets form. They produce a very unpleasant gurgling or spitting sound called rainout. The best fix is a heated tube like the ClimateLineAir 11 which keeps air at constant temperature. Otherwise, reduce humidifier level by one step, insulate the tube or place the device lower than the bed.
The ResMed AirSense 11 AutoSet is one of the quietest devices on the market, at about 27 dBA. The Philips DreamStation 2 Auto and the Löwenstein prisma SMART max follow closely. For travel, the AirMini AutoSet is surprisingly discreet given its compact size. Mask choice influences perceived noise as much as the device itself. A nasal pillow mask like the AirFit P10 adds very little noise.
If mechanical noise persists after a full clean, filter, cushion and tube replacement (deep hum, abnormal vibration, clicks), the device must go for service. A CPAP usually carries a 2-year manufacturer warranty. Beyond that, the cost of motor repair often exceeds the value compared to a new device. Contact your retailer for a service diagnosis before any decision.