ATA pressure explained: 1.3, 1.5 and 2.0 ATA

Pressure is the single most important number when comparing hyperbaric chambers, and it is measured in ATA. Get this one decision right and the rest of the choice — chamber type, size, budget — falls into place. This guide explains what ATA means and what 1.3, 1.5 and 2.0 ATA feel like in practice.

What does ATA mean?

ATA stands for atmosphere absolute, a measure of pressure. One ATA equals the air pressure at sea level. A chamber at 1.5 ATA holds pressure 50% above sea level; at 2.0 ATA it is double sea-level pressure. Higher pressure increases how much oxygen the body can absorb during a session, which is why pressure — not brand or color — is the spec that matters most.

1.3 ATA — the gentle entry point

1.3 ATA is the softest, most accessible setting, delivered by portable soft chambers. It is comfortable, quiet and easy to equalize, which makes it a popular first chamber for relaxation and daily recovery at home. The COSL13 lying chamber is a typical 1.3 ATA system.

1.3 ATA · Soft Lying Chambers COSL13 — Soft Lying Hyperbaric Chamber Entry 1.3 ATA lying chamber — spacious, foldable, value-focused. View COSL13 details →

1.5 ATA — the most popular home choice

1.5 ATA is the sweet spot for most home and wellness users: noticeably more pressure than 1.3 ATA while still comfortable and self-operated. It is the default for home wellness. Lying models like the COSL15 and spacious sitting models like the COSE15 both sit in this range.

1.5 ATA Soft Lying Chambers

COSL15

Soft Lying Hyperbaric Chamber

Premium portable lying chamber for daily home wellness and recovery.

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1.5 ATA Soft Sitting Chambers

COSE15

Extra-Spacious Sitting Chamber

Premium oversized sitting cabin with internal support frame.

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2.0 ATA — clinic-grade performance

2.0 ATA is the highest pressure in common use and is delivered two ways: by hard-shell clinic systems such as the COHT20, and by professional-grade portable soft chambers such as the COSL20 and COST20. It is preferred by clinics, recovery studios and experienced users who want maximum pressure.

1.5–2.0 ATA · Single-Person Hard Shell COHT20 — Single-Person Hard Shell Chamber Q355 carbon-steel sitting chamber with integrated oxygen system. View COHT20 details →

Side by side

Which pressure should you choose?

For a first home chamber, 1.3–1.5 ATA is the comfortable, popular starting point. For clinics, recovery studios or experienced users, 2.0 ATA delivers the strongest performance. If you are still deciding between a soft and hard-shell route to 2.0 ATA, read soft vs hard-shell chambers, then tell us your goals and we will match a model.