Crackling sounds

Occasionally I wake up due to a crackling or ice breaking sound. What is causing this? Also I have a left over cough from Covid and have continued using my CPAP but coughing into my mask. Is this bad?

Could be rainout...condensation moisture in the hose. It causes popping and crackling noises. If this is the problem, a heated hose or a hose insulation may solve it. Also, reducing the humidity level or increase the room temp. may help.

I have the humidity set on Auto and the temp on auto. My house is 68 at night. Very dry in my bedroom. Should I change the auto setting myself or wait and talk to respiratory therapist?

Lifer wrote: ↑

Sat Jan 14, 2023 6:33 pm

I have the humidity set on Auto and the temp on auto. My house is 68 at night. Very dry in my bedroom. Should I change the auto setting myself or wait and talk to respiratory therapist?

I would suggest that you learn how to change the humidity and hose temperature settings for yourself. You may find that you have to make seasonal adjustments.

If your bedroom is very dry, that means the CPAP has to add a lot of humidity to the air in the hose to get it up to 85% relative humidity, and given that your bedroom is on the (slightly) cool side, that could explain why you're getting the rainout and the crackling sounds.

If your nose is not drying out, I'd suggest changing from Auto humidity and auto temperature to a starting point with the humidity set to 4 (the middle of the humidity range) and a hose temperature set to just above your room temperature---say 69 or 70F. See how that feels for the nose and also see if it helps with the rain out issues.

In general, the higher the hose temperature, the less likely you will be to get rainout at a given humidity setting. But not everyone likes warm/hot air coming through the hose. So if you're still getting rainout with the hose set to 70F, see how far you can increase the hose temperature before the air feels too warm.

If the nose is too dry with a humidity setting of 4, try increasing it one setting at a time. If rainout persists, then you'll have to increase the hose temperature with the humidity setting.

Best of luck

Someone suggested to lower the water line in my humidifier which I did. That seemed to have stopped the rainout.


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I also started to experience what I have characterized as "popping" noises. Started in the wintertime when my bedroom started to get colder at night.

I ended up ordering a heated tube, and with my Resmed S11 set to "Auto" climate, it's been fine every since... YMMV...

My guess is that I'll switch back to the regular non-heated tube in the springtime when things warm up again...