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** Update: Resmed S9 is no longer in production, new version is ResMed AirSense 10 AutoSet with HumidAir Humidifier

When it comes to choosing the right CPAP for you, there are simply a ton of options. If you and your doctor have determined that CPAP therapy is the right choice for your condition, then you owe it to yourself to get the best machine possible. There are many options, but if you trust the wisdom of the crowd, one of the first machines you may consider is the ResMed S9 Autoset.

The ResMed S9 CPAP is one of the most popular machines on the market, and for good reason. It’s affordable, quiet, works well, and has a huge variety of attachments and accessories to choose from. We’ll go over all the details in this ResMed S9 CPAP review.


ResMed S9 Autoset Review: At a Glance

We’ll begin with an overview of this machine, and later move on to more in-depth breakdown.


  • One of the most popular machines on the market
  • Very quiet – there are foam and isolating materials around the motor. Radiated noise and around the tube are no higher than 24dba
  • Very easy to use – user-friendly controls, color screen, lightweight for travel and easy for cleaning
  • Well rated by patients and doctors alike – 4-star rating
  • Comfortable to use – all masks are easily adjustable
  • Affordable price – compared to some competitors
  • Autoset technology continually adjusts pressure based on your breathing patterns – avoiding unnecessary and unpleasant air pressure
  • Machine turns on automatically when you breathe through the mask -after the setup, just put it on and start breathing, it will automatically turn on
  • Can be used with or without a humidifier attachment – becomes lighter for traveling
  • Can be used with or without heated tubing – travel-friendly option
  • Backed by ResMed, one of the most trusted names in the industry


  • Can be expensive if paying out of pocket (the ResMed S9 cost is typically $500-$600 without a humidifier, or $750+ with the humidifier)
  • Can make a whistling sound if there is a small hole or tear.

Click here to shop the ResMed S9 Autoset.


ResMed S9 Autoset Features

  • Built-in LCD screen to change settings, view pressure, etc.
  • Warm up feature allows you to preheat water in humidifier
  • Automatic data and sleep performance recording on included SD card
  • Auto-adjusting pressure settings to match changing breathing patterns
  • Available with ClimateLine heated tubing and H5i Humidifier for comfort
  • Mask Fit feature allows you to test the fit of your mask and check for leaks
  • Adjustable humidifier


ResMed S9 Autoset Specs

  • Measures 5.5” x 5.5” X 3.4” (153mm x 140mm x 86mm) without humidifier
  • Measures 11.0” x 5.5” X 3.4” (306mm x 140mm x 86mm) with humidifier
  • Weighs 1.8lb/0.81kg without humidifier, 3.3lb/1.5kg with humidifer
  • Pressure range of 4 to 20 cm H20
  • 0-20 min ramp time; 5 min increments
  • Records and displays sleep data (summary 365 days, detailed 30 days)


ResMed S9 Autoset Review: My Experience

I am a sleep apnea patient and I have personally used the ResMed S9 CPAP for about 5 years now. It works very well for me, and I’ve had no issues with it over the years. The Autoset technology works exceptionally well – you won’t notice it, but this machine is hard at work all night long, adjusting to your changing pressure needs. It has a really nice design. It has four clearly marked large buttons that allow me to easily scroll and make changes. It has a clear big color screen which makes scrolling really easy, and t also changes color so you’ll always know which settings you are modifying.

I use the S9 Autoset with H5i humidifier and ClimateLine heated tubing, and a ResMed Airfit P10 mask (one of the best CPAP masks, in my opinion). These attachments make for a very comfortable sleeping experience when I’m at home. The ClimateLine heated tubing has a mask temperature sensor and a coil inside of it which reduces rainout throughout the hose. It’s standard size and can fit any mask. But the tube can only be used with ResMed S9 CPAP.  I find the H5i humidifier working very well for me. It adjusts to the room environment and regulates the heat and the humidity to what you set on the machine.

When I travel, I tend to leave the humidifier and heated tubing at home, and choose to just take the main CPAP unit and standard tubing. This saves me a lot of space and weight in my luggage, although the sleep experience is not quite as comfortable without a humidifier.

One of my favorite things about the ResMed S9 CPAP is how easy it is to use. Once you’ve done the initial setup, all you really need to do is press the power button and close your eyes! Actually, you don’t even need to press the button – simply put the mask on, breathe through it and the machine will turn itself on. It also auto stops, just take off the mask. Another feature that I found quite helpful is the Mask Fit option. Honestly, I was never sure whether I’ve correctly siled the mask. I just select the mask type, put the maks on and ResMed S9 runs a 3-minute diagnostics. If the maks is properly sealed, a green face will appear. If it needs adjusting, a red face will appear. Beyond that, I clean it weekly, and take the SD card in to the office when I visit a sleep doctor. The SD card records data on your sleep patterns, which you can then review with a medical professional.


ResMed S9 Review: Bottom Line

Overall, if you’re in the market for a CPAP machine, the ResMed S9 is a fantastic option. It’s easy to use with its big buttons, big screen, and its auto-start and auto-stop. It’s lightweight so it’s very easy to travel with. It’s comfortable, quiet, and is compatible with the vast majority of CPAP accessories. It has a mask fit system so you’ll always be sure that you’ve properly adjusted your mask. The ResMed S9 cost is in line with the competition, and a tremendous value considering the quality of the unit.

Hopefully you have learned something from this ResMed S9 Autoset review. If you have any questions, feel free to ask – but remember, it’s always wise to consult with your medical professional for any medical-related questions.

Click here to shop the ResMed S9 Autoset.

SleepZoo Staff

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