Singapore’s climate in numbers
The Meteorological Service Singapore’s climate summary describes a climate that barely changes through the year:
- Humidity: more than 90% in the early morning before sunrise, falling to around 60% on dry afternoons. The annual mean is about 82%, and it often reaches 100% during long spells of rain.
- Temperature: nights usually stay at 23 to 25°C; days peak at 31 to 33°C. May is the warmest month, with a 24-hour mean of 28.6°C.
- Rain: it rains on an average of 171 days a year.
For a CPAP user the important gap is between the warm, humid air outside and the cool, air-conditioned bedroom where the tube runs.
Why water collects in the tube
The humidifier warms and moistens the air. As that air travels down the hose it cools towards room temperature, and the moisture condenses into droplets, which is called rainout. The bigger the gap between the humidified air and a cold room, the more water you get. Air-conditioning blowing directly on the tube makes it worse. Our rainout explainer covers the physics in detail.
ResMed’s settings
From ResMed’s AirSense 11 user 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 |
With a ClimateLineAir heated tube and HumidAir tub on an AirSense 11, Climate Control Auto is the default. ResMed says it sets the tube to 27°C (80°F), holds 85% relative humidity and is designed to prevent rainout. Without a heated tube you can only change the humidity level, so you cannot raise the tube temperature.
Other practical steps:
- Keep the machine lower than your head, so water runs back rather than into the mask.
- Point the air-conditioner away from the bed and the hose.
- Use the cleanable water tub with distilled water if your machine’s guide calls for it, and empty it each morning.
Tubes, tubs and filters: Singapore prices
Medbitz prices, read 14 October 2026:
| Item | Price |
|---|---|
| ResMed Air11 ClimateLine Air heated tube | S$125 |
| ResMed Air10 ClimateLine Air heated tube | S$108 |
| ResMed Air10 ClimateLine Air Oxy tube | S$168 |
| ResMed SlimLine tube (unheated) | S$58 |
| ResMed Air11 water tub | S$105 |
| ResMed Air10 / HumidAir water tub | S$108 |
| ResMed Air11 hypoallergenic filters, 12 pack | S$58 |
| Philips CPAP heated tube | S$118 |
| ResMed AirMini HumidX / HumidX Plus | S$43.20 |
Medbitz also sells bundles, such as an Air10 ClimateLine Air tube with 12 hypoallergenic filters for S$108.
Why the ACE package matters here
The government-subsidised AirSense 10 AutoSet package includes a ClimateLineAir heated tube and a HumidAir cleanable tub (ACE annex). If you qualify for the subsidy you get the heated tube without buying it separately.