A ResMed CPAP machine is designed to last about 5 years. ResMed states this explicitly in the AirSense 11 user guide, listing the design life of both the device and its power supply unit at 5 years. That said, many machines continue working well beyond that mark, with some lasting a decade or longer depending on how they’re used and maintained.
What the 5-Year Design Life Actually Means
The 5-year figure isn’t arbitrary. It reflects how long the internal components, particularly the blower motor, are engineered to perform reliably under normal nightly use. Five years of sleeping roughly 8 hours a night adds up to about 14,600 hours of motor operation. After that point, the motor and other internal parts may start degrading in ways that affect therapy quality, even if the machine still turns on.
This 5-year timeline also aligns with how insurance handles replacements. Medicare classifies CPAP devices as having a 5-year “reasonable useful lifetime.” Once that period has passed, you’re eligible for a new device. A replacement before the 5-year mark is only covered if the machine is lost, stolen, or damaged beyond repair from a specific incident. Importantly, there’s no Medicare rule that forces you to replace a working machine at the 5-year mark. If yours is still performing well, you can keep using it.
Signs Your Machine Is Wearing Out
A CPAP machine rarely dies all at once. It usually gives warning signs over weeks or months. The most common one is noise. As the blower motor ages, it starts producing whining or wheezing sounds during each breath cycle that weren’t there before. If your once-quiet machine is becoming noticeably louder, that’s typically the motor losing efficiency.
You might also notice the pressure feeling weaker than usual. If your prescribed pressure is set to a certain level but the air feels less forceful, the motor may no longer be generating adequate pressure. This can compromise your treatment without being immediately obvious, since the change tends to be gradual. Some ResMed machines will display an alert on screen reading “Motor life exceeded, contact care provider,” which is a clear signal the blower has reached its limit and the device needs replacement.
Other signs include the machine running warmer than it used to, the humidifier not heating water effectively, or increased condensation in the tubing from inconsistent temperature regulation.
Accessories Wear Out Much Faster
The machine itself lasts years, but the parts you touch and breathe through need replacing far more often. ResMed’s AirSense 11 user guide rates the standard humidifier tub at just 6 months and the cleanable version at 2.5 years. Air tubing is also rated for 6 months.
Mask components have even shorter lifespans:
- Nasal cushions or pillows: every 2 weeks
- Full-face mask cushion: every month
- Mask frame: every 6 months
- Headgear and chin strap: every 6 months
- Tubing: every 3 months
These timelines exist because silicone cushions lose their seal as facial oils and cleaning break down the material. A worn cushion causes air leaks, which can trigger mouth breathing, dry throat, and fragmented sleep. The tubing also develops micro-tears and mineral buildup from humidity over time. Staying on top of these replacements is one of the most effective ways to keep your therapy working properly, and to avoid blaming the machine for problems caused by worn accessories.
What Affects How Long Your Machine Lasts
Build quality varies across models, but how you treat the device day to day plays a significant role. Keeping the machine on a stable, flat surface helps protect the motor from vibration stress. Running it in a dusty environment without regularly replacing the air filter forces the motor to work harder, which accelerates wear. ResMed machines use disposable filters that should be swapped out every few weeks, plus a reusable filter that needs periodic rinsing.
Humidity matters too. The humidifier chamber should be emptied, rinsed, and dried daily. Letting water sit in the chamber between uses promotes mineral deposits and bacterial growth, which can affect both the chamber and the internal components over time. If you travel frequently with your CPAP, the added jostling and altitude changes can contribute to wear, though travel-specific models like the ResMed AirMini are built with portability in mind.
Power surges are another overlooked factor. Plugging your CPAP into a surge protector rather than directly into a wall outlet helps shield the electronics from voltage spikes that can shorten the lifespan of the power supply or control board.
Warranty Versus Actual Lifespan
ResMed’s standard warranty covers CPAP and bilevel devices for 2 years from the date of purchase. During that period, if the device fails under normal use, ResMed will repair or replace it at no cost. This covers the machine and the external power supply unit but not consumable accessories like masks, tubing, or humidifier chambers.
The gap between the 2-year warranty and the 5-year design life means years 3 through 5 are your responsibility if something goes wrong. Some durable medical equipment suppliers offer extended service plans, which may be worth considering if you’re buying out of pocket. If your machine fails after the warranty but before the 5-year insurance replacement window, you’ll likely need documentation from your provider showing the device is no longer functional to get early coverage approved.
When Replacement Makes Sense
If your ResMed machine is past the 5-year mark and still running quietly with consistent pressure, there’s no clinical reason you must replace it. But technology does improve. Newer ResMed models offer features like Bluetooth connectivity, automatic altitude adjustment, and more refined pressure algorithms that respond to breathing changes throughout the night. The AirSense 11, for example, integrates with a smartphone app for daily sleep tracking, which wasn’t available on machines from 5 or 6 years ago.
The practical trigger for most people is performance. Once you start waking up with a dry mouth again, noticing the machine is louder, or seeing your sleep data trend worse on your app or follow-up sleep study, those are signals the machine is no longer delivering what your prescription calls for. At that point, replacement isn’t just an upgrade. It’s a restoration of effective treatment.