CPAP Machine Buying Guide for Beginners

Last updated August 2026

Quick answer: what does a first-time CPAP buyer need to know?

You need a prescription, so start with a sleep study and your doctor’s recommended pressure. For most people, an auto-adjusting APAP machine is the most comfortable first choice, paired with a heated humidifier and a mask matched to how you breathe and sleep. Expect to pay a few hundred to around a thousand dollars out of pocket, though insurance often covers a rental-to-own path. The mask matters more than the machine brand for comfort, so budget time to find the right fit. This guide walks through every decision in plain language.

First things first: you need a diagnosis and a prescription

CPAP therapy treats obstructive sleep apnea, a condition where your airway repeatedly collapses during sleep, causing you to stop breathing, drop your oxygen, and wake slightly hundreds of times a night without knowing it. The signs are loud snoring, gasping or choking in sleep, and feeling exhausted no matter how long you were in bed.

You cannot legally or safely buy a CPAP machine without a prescription in the United States, and for good reason: the machine delivers a specific air pressure that a clinician determines from a sleep study (either an overnight lab test or an at-home test). That study also produces your AHI (apnea-hypopnea index, the number of breathing events per hour) and the pressure setting your machine needs. Do not skip this step or buy a used machine off a marketplace to avoid it.

How CPAP machines work

A PAP (positive airway pressure) machine is essentially a quiet, precise blower. It draws in room air, filters it, optionally warms and humidifies it, and delivers it through a hose and mask at a pressure high enough to act as an “air splint” that holds your airway open. That is the whole trick: steady pressure prevents the collapse, so you breathe smoothly and stay asleep.

CPAP vs APAP vs BiPAP: which type do you need?

The three main machine types differ in how they deliver pressure. Your prescription usually points to one.

For a first-time buyer, APAP is usually the sweet spot. It handles the fact that you need more pressure on your back than your side, or when congested, without you touching anything, and most APAP units can also run in fixed CPAP mode. BiPAP is typically reserved for specific clinical needs and prescribed deliberately.

Key features that affect comfort (and adherence)

The best machine is the one you will actually use every night. These features drive comfort:

• Heated humidifier. Nearly essential. It prevents the dry mouth, nose, and throat that make people quit. Look for adjustable humidity.
• Heated tubing. Reduces “rainout,” the condensation that pools in the hose when warm, moist air hits a cool bedroom. Worth it in cold rooms.
• Ramp. Starts at a low pressure and gradually builds to your prescribed level, so falling asleep feels gentler.
• Expiratory pressure relief. Briefly drops the pressure as you breathe out, so you are not exhaling against a strong stream. Different brands name this feature differently.
• Quiet operation. Modern machines are very quiet (around 25 to 30 decibels); check reviews if you or a partner are noise-sensitive.
• Data tracking. Onboard and app-based reporting of your AHI, mask leak, and usage helps you and your clinician fine-tune therapy. Many insurers also require usage data to keep covering the equipment.
• Portability. If you travel often, size, weight, and battery options matter.

Do not overlook the mask

Here is the most important thing beginners get wrong: the mask matters more for success than the machine. A mediocre machine with a well-fitting mask beats a premium machine with a leaky, uncomfortable one. Masks come in three broad styles:

• Nasal pillow masks seal at the nostrils with minimal contact. Light and open, great for people who feel claustrophobic, read in bed, or move a lot. Best at lower pressures. See our nasal mask overview.
• Nasal masks cover the nose. A balanced middle ground, good for a wide range of pressures and side sleepers.
• Full face masks cover nose and mouth. Necessary for mouth breathers and people with chronic congestion, and for higher pressures. See our full face mask overview.

Fit is individual, and most people try more than one before landing on their favorite. A good durable medical equipment supplier will let you fit and swap masks early on. Expect to replace cushions and headgear regularly; our CPAP cleaning guide covers upkeep and replacement timing.

Solid machines to know

These three are widely used, well-supported, and data-capable:

• ResMed AirSense 11 is the popular APAP standard: quiet, easy app, strong auto-adjusting algorithm, integrated humidifier. See our AirSense 11 review or look it up on Amazon.
• Philips DreamStation 2 is a compact, well-regarded APAP with a low profile and good humidification; details in our DreamStation 2 review.
• Fisher & Paykel SleepStyle is a straightforward, comfortable option with built-in humidification and a simple interface, a good value pick; see the SleepStyle review.

Because these require a prescription, the cleanest path is buying through your supplier or a reputable retailer that verifies your prescription. For the full breakdown of specs and fitting, read our CPAP buying guide and browse the CPAP and BiPAP hub.

Cost and insurance basics

Out of pocket, a new machine typically runs a few hundred dollars up to roughly a thousand, with masks and supplies on top. But most people go through insurance:

• Coverage usually requires a qualifying sleep study, a prescription, and proof you use the machine (often a minimum number of hours on a minimum number of nights over a set period). The machine’s data reporting handles this automatically.
• Many plans use a rental-to-own model, paying monthly for around a year before you own the device, rather than buying it outright.
• Supplies are replaced on a schedule your insurance allows (masks, cushions, filters, tubing), so keep track of your eligibility dates.

Ask your supplier for an itemized estimate and confirm whether buying outright might be cheaper than a long rental if your deductible is high.

FAQ

Can I buy a CPAP without a prescription? No. CPAP machines are regulated devices in the United States and require a valid prescription, which comes from a sleep study interpreted by a clinician. The prescription also sets the pressure the machine must deliver, so it is not a formality you can skip.

Is APAP better than CPAP for a beginner? For most beginners, yes. APAP adjusts pressure automatically as your needs change through the night, which tends to feel more comfortable and forgiving, and it can run in fixed mode too. A plain CPAP is still fine if your clinician recommends a single set pressure.

How long until CPAP therapy helps? Some people feel more rested within days, but adjusting to the mask and pressure often takes a few weeks. Consistency is what makes it work, so use it every night and address comfort problems early rather than giving up.

What if I breathe through my mouth at night? A full face mask that covers the nose and mouth is usually the answer, sometimes combined with a heated humidifier or a chin strap. Tell your supplier you are a mouth breather so they fit you correctly from the start.

Bottom line

Start with the sleep study and prescription, then let comfort guide the rest. An APAP machine with a heated humidifier suits most first-timers, and the mask, fitted to how you breathe and sleep, matters more than the brand on the blower. Use your insurance’s rental-to-own path if it lowers cost, lean on your supplier for mask swaps early, and commit to nightly use while you adjust. A proven machine like the ResMed AirSense 11 plus a well-fitted mask is a reliable place to begin. For deeper detail, read our full CPAP buying guide.