How to dial in humidity

Relatively new APAP user here. I was wondering how others dial in their humidity setting? I have a Airsense 10 with the slimline tubing. The relative humidity in my bedroom has ranged from 35-50% in the past month. So far I have turned off the humidifier when relative humidity was >40% and set it at 1 when it was <40%. Is that reasonable? What would you suggest?

Humidity needs or preferences is highly individualized. No one certain setting or environment works for all people.
My ambient humidity in my bedroom is almost always at least 50% but that is far from enough to keep my nasal mucosa happy and I need a setting of 6 for humidity and sometimes that isn't really enough.

Experiment and figure out what your nose wants.
The nasal mucosa is what must be kept happy. If they aren't happy you can get some really ugly allergy like symptoms...
congestion, drainage, pressure, itchy, sneezing, etc.
Google "cpap rhinitis" and read up on it.

I don't let the ambient humidity factor into the settings though....the machine will factor that in for you and try to maintain whatever setting humidity you choose no matter what the ambient humidity is. Let the machine do its job.

Example....suppose your ambient humidity is 45% and you choose a setting of 3 which might mean 70% delivered moisture (I don't remember what each setting is to deliver)....the machine knows that it is starting off with 45% and will auto adjust the heat to the water so you get a grand total of 70%.
Now if for some reason the ambient humidity increases to 65%....you won't need much added moisture to maintain the 70%. Won't use much water if that's the case.

Last night my ambient humidity was 80%....lots of rain going on and windows open...even with my humidity setting of 6 which amounts to around 90% I think....I didn't use much water last night.

Keep your nasal mucosa happy and don't worry about changing settings based on ambient humidity.

Bear in mind that sometimes individuals just have different preferences. I know a husband and wife who are both on cpap and one doesn't even use a humidifier and the other pretty much prefers maximum added moisture....and they both are starting out with the same ambient humidity.

Figuring out what your nasal mucosa might prefer....trial and error on your part.

Thanks so much Pugsy! Really appreciate it

I use a heated hose with my Airsense 10 Autoset FOR HER,
with the automatic settings --year round. The machine does all the work.
Humidity in our house ranges from 15% to 80%, and the only difference
is the amount of water left in the tank in the morning.
Heated hose makes all the difference.