No, CPAP machines are not all the same. The main types are fixed-pressure CPAP, auto-adjusting APAP, BiPAP, and compact travel CPAP, plus doctor-prescribed ASV and AVAPS for complex or central sleep apnea. The right one depends on your diagnosis, your pressure needs, and your lifestyle. This guide defines each type, compares them on cost and best use, and points you to the right machine, but the final choice is set by your prescription [1].
Are All CPAP Machines the Same?
No. CPAP machines differ mainly in how they deliver pressure. Fixed CPAP holds one constant pressure all night [2]. APAP raises and lowers pressure automatically as you breathe [3]. BiPAP uses two separate pressures, higher when you inhale and lower when you exhale [2]. Travel CPAP is a compact version of a fixed or auto machine, and ASV or AVAPS are advanced, prescription-only machines for central and complex breathing disorders [4].
What Are the Different Types of CPAP Machines?
There are five main types of CPAP-family machines: fixed CPAP, APAP (auto-adjusting), BiPAP (bilevel), travel CPAP, and the advanced ASV and AVAPS modes. They all treat sleep-disordered breathing with pressurized air, but they differ in how the pressure is delivered and who they are for. Here is a side-by-side comparison (Sleeplay prices as of September 2026):
| Type | How it works | Best for | Rx? | Price at Sleeplay | Example |
|---|---|---|---|---|---|
| Fixed CPAP | One constant prescribed pressure all night [2] | Stable, consistent pressure needs | Yes | Varies by model | Browse CPAP machines |
| APAP (auto CPAP) | Auto-adjusts pressure breath by breath within a set range [3] | Pressure that varies by position or sleep stage | Yes | $960 to $1,004 | ResMed AirSense 11 / 10 |
| BiPAP (bilevel) | Two pressures: higher inhale (IPAP), lower exhale (EPAP) [2] | CPAP intolerance, higher pressures, COPD overlap | Yes | $1,199 | ResMed AirCurve 10 VAuto |
| Travel CPAP | Compact, battery-capable, FAA-compliant CPAP or APAP [7] | Frequent flyers and campers | Yes | $919 | ResMed AirMini |
| ASV / AVAPS | Advanced bilevel; ASV targets central apnea, AVAPS targets a set tidal volume [4][6] | Central or complex apnea, hypoventilation | Yes, specialist-prescribed | Varies | See your sleep doctor |
Fixed-Pressure (Standard) CPAP Machines
A fixed CPAP delivers one steady pressure, set from your titration study, the whole night regardless of how your breathing changes [2]. It is the original PAP design and often a lower-cost option, and it works well for people with a stable, consistent pressure need. You can browse CPAP machines to see current fixed and auto models in one place.
APAP (Auto-Adjusting CPAP) Machines
APAP, also called auto-CPAP or autopap, senses your breathing and raises or lowers pressure automatically within a prescribed range throughout the night [3]. It suits people whose pressure needs shift with sleep position or sleep stage. The ResMed AirSense 11 AutoSet is a widely used auto-adjusting model at $1,004, and the earlier-generation ResMed AirSense 10 AutoSet is $960 (September 2026).
In our AirSense 11 walkthrough, James Curles, a Sleep Coach at Sleeplay, calls it "one of my favorite machines out there, and the AirSense 10 as well, two of the top ones," and notes the ResMed myAir app "just walks you through everything." Here is the full setup guide:
BiPAP (Bilevel) Machines
BiPAP, or bilevel, delivers two pressures: a higher one on inhale (IPAP) and a lower one on exhale (EPAP), which makes breathing out easier for people who struggle against constant CPAP pressure [2]. Doctors prescribe it for higher-pressure needs, CPAP intolerance, and conditions like COPD overlap [2]. The ResMed AirCurve 10 VAuto is a common auto-adjusting bilevel at $1,199. For the full comparison, read our CPAP vs. BiPAP guide.
Travel CPAP Machines
Travel CPAP machines are compact, lightweight versions of a fixed or auto CPAP, built for battery power and FAA-compliant carry-on use [7]. The ResMed AirMini AutoSet weighs about 300 grams and is one of the smallest available at $919 [7]. See our best travel CPAP machines roundup for model-by-model picks.
ASV and AVAPS Machines
ASV (adaptive servo-ventilation) and AVAPS (average volume-assured pressure support) are advanced bilevel therapies. ASV adjusts breath by breath to treat central and complex sleep apnea [4], while AVAPS varies pressure support to hit a set tidal volume for hypoventilation conditions like obesity hypoventilation or COPD overlap [6]. These are prescribed and titrated by a sleep specialist only, never a self-selected upgrade from CPAP or BiPAP. Important safety note: ASV is contraindicated in patients with chronic, symptomatic heart failure (NYHA 2 to 4) with reduced left ventricular ejection fraction (LVEF of 45% or less) and moderate to severe predominant central sleep apnea [5]. Learn more in our guide to ASV machines and central sleep apnea overview.
Which CPAP Machine Is Right for You?
The right machine depends on your prescription, your pressure tolerance, and how you live. Match your situation to a type:
- New to therapy or a stable, mild-to-moderate diagnosis: a fixed CPAP is the simplest and most affordable place to start.
- Your pressure needs vary by night or position: an APAP adjusts in real time, so you are not locked to one pressure.
- You struggle to exhale against pressure, or need higher pressures: a BiPAP splits inhale and exhale pressure to make breathing out easier.
- You travel or fly often: a travel CPAP like the AirMini is compact, battery-capable, and FAA-compliant.
- You have central or complex sleep apnea: ASV or AVAPS may be needed, but only as prescribed and titrated by your sleep physician.
If you are still choosing, our APAP vs. CPAP guide and how to buy a CPAP machine walk through the decision, and how a CPAP machine works covers the basics.
How Much Does a CPAP Machine Cost?
At Sleeplay, an auto-adjusting CPAP runs $960 to $1,004 (ResMed AirSense 10 and 11), an auto-adjusting BiPAP is $1,199 (AirCurve 10 VAuto), and a travel CPAP is $919 (AirMini), all as of September 2026. Fixed CPAP and specialty ASV or AVAPS machines vary by model. Insurance, financing, and current promotions can lower your out-of-pocket cost, so check the live listing on each product page for the current price.
Do You Need a Prescription for a CPAP Machine?
Yes. In the United States, CPAP, APAP, BiPAP, and travel CPAP are FDA-regulated Class II medical devices sold by prescription only [8]. ASV and AVAPS additionally require titration by a sleep specialist because of their use in central and complex apnea. If you do not have a prescription yet, start with a sleep test; our guide to buying a CPAP machine explains the steps and what documentation you need.
Can CPAP Accessories Be Swapped Between Machine Types?
Often, but not always. Standard masks, tubing, and filters are largely interchangeable across CPAP, APAP, and BiPAP machines, since most share a common tubing connection. But heated tubing, humidifier chambers, and machine-specific filters are model-specific, and some travel CPAPs, like the AirMini, use their own tubing and mask setup [3]. Always confirm compatibility with your exact model before buying. If a machine is causing discomfort, our CPAP side effects guide covers common fixes, and what OSA means explains the condition these machines treat.
The Bottom Line: Matching a Machine to You
Fixed CPAP, APAP, BiPAP, travel CPAP, and ASV/AVAPS solve different problems, so the best machine is the one that fits your prescription and your life, not the most expensive one. Most people with obstructive sleep apnea do well on a fixed or auto CPAP [1]; higher pressures or exhale trouble point to BiPAP; travel points to a compact model; and central or complex apnea is a doctor-directed ASV/AVAPS decision. Our sleep specialists can help you match a machine to your prescription.
Frequently Asked Questions
Are all CPAP machines the same?
No. They differ by pressure delivery: fixed CPAP holds one steady pressure, APAP auto-adjusts, BiPAP uses two pressure levels, travel CPAP is a portable version, and ASV or AVAPS are prescribed for central or complex sleep apnea.
What is the difference between CPAP and APAP?
CPAP delivers one fixed pressure all night. APAP, also called auto-CPAP or autopap, senses your breathing and raises or lowers pressure in real time, which helps if your needs change by position or sleep stage.
What is a BiPAP machine used for?
BiPAP delivers two pressures, higher on inhale and lower on exhale, so it is easier to breathe out. Doctors prescribe it for people who need higher pressure or cannot tolerate constant CPAP pressure, including some COPD cases.
What is an ASV or AVAPS machine?
ASV and AVAPS are advanced bilevel therapies for central or complex sleep apnea and hypoventilation. A sleep specialist prescribes and titrates them; they are never a self-selected upgrade from CPAP or BiPAP.
How much does a CPAP machine cost?
At Sleeplay in September 2026, auto CPAPs run $960 to $1,004, an auto BiPAP is $1,199, and a travel CPAP is $919. Fixed and specialty ASV or AVAPS machines vary. Check each product page for the current price.
Do I need a prescription for a CPAP machine?
Yes. In the US, CPAP, APAP, BiPAP, and travel CPAP are FDA-regulated Class II devices sold by prescription only. ASV and AVAPS also require titration by a sleep specialist.
Which CPAP machine is best for travel?
A travel CPAP like the ResMed AirMini is built for it: compact, about 300 grams, battery-capable, and FAA-compliant for carry-on. It is the right pick for frequent flyers and campers.
Can I use the same mask and accessories with any CPAP machine?
Usually. Most masks, tubing, and filters share a 22 mm connection across CPAP, APAP, and BiPAP. But humidifier chambers, heated tubing, and travel-CPAP setups are model-specific, so confirm compatibility with your exact machine first.
How do I know which type of CPAP machine is right for me?
It depends on your prescription, pressure tolerance, and lifestyle: fixed CPAP for stable needs, APAP for variable pressure, BiPAP for exhale trouble or high pressure, travel CPAP for flyers, and doctor-prescribed ASV or AVAPS for complex apnea.
References
- AASM 2019 Clinical Practice Guideline: PAP (CPAP/APAP) for adult OSA
- Cleveland Clinic: BiPAP (bilevel) vs CPAP pressure delivery and uses
- ResMed AirMini: CPAP, AutoSet (APAP) and AutoSet for Her auto-adjusting modes
- ResMed AirCurve 10 bilevel: IPAP/EPAP two-pressure and ASV for central sleep apnea
- AASM: ASV contraindication in symptomatic chronic heart failure (LVEF <=45%)
- StatPearls (NCBI): AVAPS average volume-assured pressure support
- ResMed AirMini device fact sheet: 300 g, 4-20 cm H2O, FAA/DO-160
- FDA 21 CFR 868.5895: continuous ventilator (CPAP delivery), Class II device
Get useful articles straight to your inbox
