CPAP Machine Buying Guide
Last updated August 2026
Quick answer
For most people newly diagnosed with obstructive sleep apnea, an auto-adjusting machine (APAP) with an integrated heated humidifier, heated tubing, and expiratory pressure relief is the best choice, and it needs a prescription. Prioritize a comfortable, well-fitting mask over any single machine feature, because mask fit is the number one reason therapy succeeds or fails. Budget 400 to 1,500 dollars cash, or use insurance through a DME supplier.
Important disclaimer
A CPAP is a Class II medical device. You cannot legally buy one in the United States without a prescription from a licensed provider, and you should not self-diagnose sleep apnea. This guide helps you have an informed conversation with your doctor and choose wisely among prescribed options; it is not medical advice. Untreated sleep apnea raises the risk of high blood pressure, heart disease, stroke, and daytime accidents, so if you suspect it, get a sleep study.
Machine types: CPAP, APAP, and BiPAP
Different machines suit different diagnoses and comfort needs.
- CPAP (continuous positive airway pressure). Delivers one fixed pressure all night, set from your sleep-study titration. Simplest and least expensive, but the fixed pressure can feel like too much when you are awake and too little when you shift position.
- APAP (auto-adjusting). Continuously raises and lowers pressure within a prescribed range to match your breathing. It adapts to sleep position, alcohol, congestion, and weight changes, which is why it is the most comfortable starting point for most new users.
- BiPAP (bilevel). Uses a higher pressure for inhalation and a lower one for exhalation. Reserved for specific situations: central sleep apnea, COPD overlap, high pressure requirements, or poor CPAP tolerance.
| Type | Pressure behavior | Best for | Relative cost |
|---|---|---|---|
| CPAP | One fixed setting | Stable, straightforward OSA | Lowest |
| APAP | Auto-adjusts in a range | Most new users, variable needs | Moderate |
| BiPAP | Two levels (inhale/exhale) | Central apnea, COPD, high pressure | Highest |
Key features that affect comfort
Heated humidifier. The most important comfort feature. Dry, pressurized air causes dry mouth, nosebleeds, and congestion, and integrated heated humidification prevents it. Look for a machine with the humidifier built in rather than a bolt-on tank.
Heated tubing. Warms the air path so moisture does not condense into water droplets (“rainout”) that spit at your face. Nearly essential if you keep a cool bedroom.
Expiratory pressure relief (EPR/flex). Drops pressure slightly as you breathe out so exhaling against the airflow feels natural. This is a make-or-break comfort setting for many beginners.
Ramp. Starts at a low, gentle pressure and eases up to your prescribed level over 5 to 45 minutes, making it easier to fall asleep.
Connectivity. Wi-Fi, Bluetooth, or cellular data lets your clinician read compliance and fine-tune settings remotely, and lets you track your own AHI and leak numbers in an app.
Noise. Modern machines run at roughly 25 to 30 dBA, about the level of a whisper. Anything under 30 dBA will not disturb a partner.
Masks matter more than the machine
You can buy the best machine made and still quit therapy if the mask leaks or hurts. Try more than one style during your fitting period; most DME suppliers allow a 30-day mask exchange.
- Nasal pillows. Soft tips seal at the nostril entrance with minimal facial contact. Ideal for claustrophobic users, side sleepers, and people who read or watch TV before bed. Explore the CPAP nasal mask style.
- Nasal masks. Cover the nose and offer a strong, stable seal at moderate pressures. The best all-around choice for most nose breathers.
- Full-face masks. Cover nose and mouth, required if you breathe through your mouth or have nasal obstruction, and better at high pressures. See the CPAP full-face mask option.
If nasal congestion is your barrier, treating it can let you move from a full-face to a lighter nasal mask. Head-of-bed elevation can also help; our adjustable base buying guide covers positioning.
Recommended machines by need
Every machine below is an APAP, the best default for new users. Compare them all on our CPAP and BiPAP machines hub.
- Quietest and best app: the ResMed AirSense 11 runs near 27 dBA with excellent coaching software.
- Best for travel: the Philips DreamStation 2 is compact with an optional integrated battery for camping and flights.
- Best simple humidification: the Fisher and Paykel SleepStyle has an easy-to-fill humidifier and straightforward controls.
Insurance and price tiers
Through insurance (DME supplier). Most plans, including Medicare, cover CPAP with a documented diagnosis. A Durable Medical Equipment supplier bills insurance, provides setup, and supplies masks. Insurers usually require compliance data, commonly at least 4 hours of use on 70 percent of nights over a 30-day window, to keep coverage active.
Cash purchase. APAP machines run roughly 400 to 1,500 dollars cash, and online retailers often beat DME cash prices. You still need a valid prescription to buy. A quick Amazon search for CPAP supplies and accessories is useful for replacement filters, tubing, and cushions between resupply cycles.
Budget for consumables too: filters (monthly), cushions and pillows (every 2 to 4 weeks), tubing (every 3 months), and the humidifier chamber (every 6 months). Insurance resupply programs cover much of this on a schedule.
Adjusting to therapy: the first month
The first few weeks are the hardest, and knowing that up front keeps people from quitting too early. Start by wearing the mask for short stretches while awake, watching TV or reading, so your face and brain get used to the sensation before you sleep in it. Use the ramp feature so the pressure builds gently as you drift off, and turn on expiratory pressure relief if exhaling feels like a fight.
Track two numbers in your machine or app: the AHI (apnea-hypopnea index), which should drop below 5 events per hour on effective therapy, and mask leak, which tells you whether your seal is holding. A high leak number almost always points to mask fit rather than the machine, so adjust the headgear tension or try a different cushion size before assuming anything is wrong. Dry mouth means turning up the humidifier; a wet, spitting hose means turning on or up the heated tubing. Most people who push through the first 30 days and dial in these settings go on to use therapy comfortably for years. If you are genuinely miserable after a fair trial, that is a conversation to have with your provider, not a reason to shelve the machine.
Common mistakes to avoid
- Buying online without a prescription. It is illegal and voids insurance; legitimate sellers will ask for your script.
- Fixating on the machine, ignoring the mask. Mask fit drives success. Reserve your energy and trial period for finding the right mask.
- Skipping humidification. Dry airway symptoms are the fastest route to abandoning therapy. Use the heated humidifier and heated tubing.
- Turning off the data. Compliance reporting protects your insurance coverage and helps your clinician help you. Keep the machine connected.
- Quitting when it feels hard early. Adjustment takes weeks. If you truly cannot tolerate it, ask about BiPAP, different pressure relief, or an oral appliance rather than stopping treatment.
Frequently asked questions
Do I need a prescription to buy a CPAP? Yes. CPAP machines are prescription-only medical devices in the United States, both by law and for insurance coverage. You need a diagnosis and a titration or auto-range order.
How loud is a CPAP machine? Modern units run around 25 to 30 dBA, comparable to a whisper. Quiet models such as the ResMed AirSense 11 near 27 dBA will not disturb most partners.
Can I travel with my CPAP? Yes. It is a medical device and does not count against carry-on limits. Travel-oriented machines like the Philips DreamStation 2 offer an integrated battery for use away from power.
How do I clean my CPAP? Daily, empty and rinse the humidifier chamber and wipe the mask. Weekly, wash the tubing, chamber, and mask cushion in warm soapy water. Monthly, replace or clean filters. Avoid harsh chemicals and essential oils.
What if I cannot tolerate CPAP? Talk to your doctor before quitting. Options include BiPAP, better expiratory pressure relief, a different mask, positional therapy, oral appliances, or surgical evaluation. Untreated apnea has serious health consequences.
Bottom line
Choose an APAP with integrated heated humidification, heated tubing, and expiratory pressure relief, then spend your effort finding a mask that seals comfortably in your sleep position. Keep the machine connected so your data protects your coverage and guides your care. If money is tight, buy the machine on insurance through a DME and shop consumables online. Start by comparing prescribed options on our CPAP and BiPAP machines hub, and always let your prescribing provider make the final call.