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Hyperbaric vs Hypobaric Chamber: What Is the Difference?
September 27, 2026 2 min read
Short answer: A hyperbaric chamber raises the air pressure around you above normal atmospheric pressure. A hypobaric chamber lowers it, which is how altitude is simulated. The home chambers we sell are hyperbaric: mild soft-shell models run at about 1.3 to 1.5 ATA and hard-shell models up to 2.0 ATA.
Last reviewed: September 2026. Educational only, not medical advice. See our disclaimer.
The two side by side
| Hyperbaric | Hypobaric | |
|---|---|---|
| Prefix | Hyper means over | Hypo means under |
| Pressure | Above sea-level pressure | Below sea-level pressure |
| Typical use | Pressurized sessions, often with oxygen-enriched air | Simulating altitude, for example in aviation and altitude research |
| Units | ATA (atmospheres absolute); 1.3 ATA is about 4.4 PSI above room pressure | Reported as an equivalent altitude or pressure below 1 ATA |
| Our range | Yes, from about $4,095 to $82,000 | Not sold |
Where people mix them up
- Hyperbaric versus hypoxic altitude training. Altitude training lowers the oxygen available; a hyperbaric chamber raises pressure. They are different tools.
- Hyperbaric versus hyperbolic. Hyperbolic is a math and language term; the chamber word is hyperbaric.
If you are shopping for a home chamber
Look for pressure in ATA, whether oxygen equipment is included, the manufacturer's warranty and what it states about prescriptions. Start with pressure levels explained, what hyperbaric oxygen therapy is and the hyperbaric chamber guide.
Frequently asked questions
Is a home hyperbaric chamber hypobaric?
No. Home hyperbaric chambers raise pressure. A hypobaric chamber lowers it.
What does ATA mean?
Atmospheres absolute. 1 ATA is sea-level pressure, so 1.3 ATA is 30% above it.
A hyperbaric chamber is a pressurized, oxygen-enriched environment. Use only as directed in the manufacturer's manual, keep flames, sparks and heat sources away, and consult a physician before use. Not intended to diagnose, treat, cure, or prevent any disease or medical condition.