Machine and humidifier
CPAP Condensation in a Cold Bedroom: How to Stop It
A cold bedroom is the most common trigger for condensation in CPAP tubing and masks, because warm humidified air cools quickly as it travels through the hose. Keep the machine below the bed, insulate or heat the tube, and use small comfort setting changes. A room humidifier or a slightly warmer room can also help.
Signs
- Condensation or water beads inside the hose on cold nights
- Damp face or wet mask in the morning
- Gurgling in the tube that gets worse as the night gets colder
- Cold air that feels unpleasant to breathe
- Dry nose or sinus irritation when humidity is turned down to stop water
Common causes
- Large temperature gap
- Cold air can hold less moisture. When the room is much colder than the humidifier, more water drops out inside the tube.
- Cold, dry air irritating your nose
- ResMed notes cold, dry air is less comfortable to breathe, can cause dry mouth, and makes your nose work harder to warm the air, which can cause sinus headaches and irritation.
- Settings that worked in summer
- A humidity level that was fine in a warm room may be too much for a cold one. Settings often need small seasonal changes.
Fixes to try, easiest first
Keep the machine lower than your head
Place the machine below the level of your mattress so condensation drains back toward the humidifier rather than toward your face. ResMed recommends this when using humidification with a cold.
Run the hose under the covers
Tuck the tube under your blanket or comforter. Your body heat keeps the air in the hose warmer and reduces condensation for free.
Add a tubing cover
A fabric tube wrap insulates a standard hose. ResMed says a tube jacket is particularly helpful in very cold rooms.
Make small humidity and tube temperature changes
If your machine lets you set humidity and tube temperature, change one notch at a time. ResMed advises small changes, because air much warmer in the humidifier than in the tube causes rainout and air that is too hot can lose the moisture you wanted.
Use heated tubing with automatic climate control
Heated tubing keeps air warm to the mask. On ResMed machines that support it, Climate Control Auto adjusts settings based on room conditions to help prevent rainout.
Warm the room or add a room humidifier
Raising the bedroom temperature a few degrees narrows the gap. If the room is very dry, ResMed suggests asking your equipment provider whether a room humidifier would help.
Watch for an empty water chamber
ResMed notes your humidifier should not run out of water, and if it does in cold weather it is likely magnifying an existing mask leak. Refit the mask if the tub is empty by morning.
Condensation is an equipment and comfort issue. Call your equipment provider if you need heated tubing or a compatible humidifier. Talk to your sleep doctor if winter dryness causes nosebleeds, ongoing congestion or sinus pain that keeps you from using CPAP, or if your machine data shows high leak.
Supplies that can help
Tubing with a built-in heating wire that keeps humidified air warm all the way to the mask, which is the main fix for rainout (water droplets …
A fabric sleeve that slips over CPAP tubing to insulate it, reduce condensation and make the hose feel softer against your skin.
Distilled water is what most CPAP humidifier chambers are meant to be filled with, because it leaves little or no mineral scale behind.
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Mask types this applies to
Frequently asked questions
What room temperature is best for CPAP?
No single number is required, but condensation gets worse the colder the room is relative to the humidifier. If you keep the bedroom cold, plan on heated tubing or a tube cover, and keep the machine below the bed.
Why does my CPAP air feel freezing at night?
Air from the machine picks up the temperature of the room as it travels through an unheated hose. A heated tube lets you set the air temperature at the mask. On the AirSense 11 the Auto tube temperature is 27 C.
Can I put my CPAP on the floor to keep it below the bed?
Fisher and Paykel advise against keeping the device on the floor under normal circumstances. Use a low nightstand or shelf that sits below mattress height instead.
Sources
Last reviewed October 11, 2026. How we research · Report an error