Now running it in heated hose mode on setting of 3 which is highest in that mode. Puts more humidity out than the other mode but I cant tell a difference in the numbers. If stuffed up or have a cold I max the humidity out. If not I drop it a notch or two. Other than comfort cant see a difference in AHI. I do have mild COPD but doesnt seem to bother me either way.
But I didnt know I was getting less O2 the higher the humidity is set. Never felt any difference. Live and learn I reckon LOL.