How we compiled this: from ResMed’s AirSense 11 user guide and the AirCurve 11 user guide, plus prices from ResMed’s eShop checked on 13 October 2026. HHZ didn’t test the tubing.
Side by side
| Spec | ClimateLineAir 11 | SlimLine | Standard |
|---|---|---|---|
| Price (ResMed eShop, 13 Oct 2026) | $49 | $37 | Not listed |
| Heated | Yes | No | No |
| Inner diameter | 0.6 in (15 mm) | 0.6 in (15 mm) | 0.74 in (19 mm) |
| Length | 6 ft 6 in (2.0 m) | 6 ft (1.8 m) | 6 ft 6 in (2.0 m) |
| Tube temperature range | 60–86°F (16–30°C) | — | — |
| Temperature cut-out | 106°F (41°C) or below | — | — |
| Maximum recommended pressure | 30 cmH2O | 30 cmH2O | 30 cmH2O |
| Enables Climate Control | Yes, with HumidAir 11 tub | No | No |
ResMed also sells ClimateLineAir Oxy for Air11 devices, $70 on its eShop. We haven’t reviewed its guide; ask your provider whether you need it when using CPAP with oxygen.
Climate Control: Auto vs Manual
| Setting | What ResMed says it does |
|---|---|
| Auto (default, recommended) | Tube at 80°F (adjustable 60–86°F or off); humidity held at 85% relative humidity; protects against rainout |
| Manual | Set temperature and humidity separately; rainout protection isn’t guaranteed. If rainout happens, raise the tube temperature first |
Humidity output by tubing (AirSense 11 guide)
| Tubing and setting | Relative humidity at 72°F room | Absolute humidity |
|---|---|---|
| SlimLine or standard, humidity 4 (default) | 80% | 6 mg/L or more |
| SlimLine or standard, humidity 8 (max) | 100% | Over 12 mg/L |
| ClimateLineAir 11, Climate Control Auto | 85% | 12 mg/L or more |
So heated tubing in Auto gives humidity comparable to the top unheated setting, while warming the tube to reduce condensation.
Troubleshooting from ResMed’s guide
| Problem | ResMed’s suggestion |
|---|---|
| Dry or blocked nose | Increase the humidity level |
| Water droplets on your nose, in the mask or tubing | Decrease humidity, or increase tube temperature |
| Very dry mouth | Air may be escaping through your mouth; consider a chin strap or full-face mask |
More in CPAP rainout, CPAP dry mouth and CPAP nasal congestion.
Verdict
If you use an AirSense 11 or AirCurve 11 with the humidifier and wake to water in the tube or mask, ClimateLineAir 11 is the documented fix, for $12 more than SlimLine at ResMed’s prices. If you don’t use the humidifier or never get rainout, SlimLine is cheaper. Tubing has a 90-day ResMed warranty, so plan regular replacements (CPAP supplies schedule).
Related: AirSense 11 review, AirSense 11 settings, how to clean CPAP.