An auto-adjusting CPAP machine, or APAP, automatically raises and lowers your air pressure breath by breath instead of holding one fixed setting. Also called an auto CPAP machine or an APAP machine, it keeps you at the lowest pressure you need at each moment of the night. Below you can shop APAP machines from ResMed, React Health (3B Medical), and Transcend, including travel models and Certified Pre-Owned options. All are FSA/HSA eligible and require a prescription.

How an APAP machine works

An APAP machine uses sensors to read your breathing and auto-titrates the pressure: it eases off when your airway is stable and adds pressure when it detects snoring, airflow limitation, or an apnea. Most auto CPAP machines run within a 4 to 20 cm H2O range, and your clinician sets the minimum and maximum that are right for you. A standard fixed CPAP, by contrast, holds a single pressure all night. Want the full comparison? Read APAP vs CPAP: which one should you choose?

Is an auto CPAP machine right for you?

Auto CPAP is often considered for people whose pressure needs change through the night, such as positional sleepers, people whose needs shift with sleep stage or weight, and those who found a single high fixed pressure hard to exhale against. It is not right for everyone: providers may not recommend APAP for conditions such as central sleep apnea or certain respiratory issues, so your doctor confirms it fits your diagnosis. Not sure where you stand? Read how to know if auto CPAP is right for you.

Comfort features to look for

• Ramp: starts therapy at a lower pressure and rises gradually to your set pressure as you fall asleep.
• EPR (expiratory pressure relief): eases the pressure as you breathe out so exhaling feels more natural.
• Heated humidification: adds moisture to reduce a dry nose or throat. The AirSense 11 and AirSense 10 use built-in HumidAir; the AirMini uses a waterless HumidX.
• Data tracking: many machines record your usage and your AHI and can connect to an app like myAir, so you and your clinician can review your therapy.

If your pressure ever feels too strong, do not change the settings yourself. Read is your CPAP pressure too high? and talk with your clinician.

Shop auto-adjusting CPAP (APAP) machines

Our active APAP line-up includes the ResMed AirSense 11 AutoSet, the ResMed AirSense 10 AutoSet, the travel-sized ResMed AirMini AutoSet, the 3B Medical Luna G3, the React Health G3 X, and the Transcend Micro Auto for travel, plus Certified Pre-Owned options. Looking for every machine, including fixed-pressure CPAP? See all CPAP machines, or browse our travel CPAP machines. Need two-pressure therapy? BiPAP machines are a separate device class.