The Trilogy does what the bi-pap does, but better. The reason is that the Trilogy can be very closely calibrated to meet your exact needs. The bi-pap can't be nearly as closely calibrated and therefore isn't as effective. I have several friends who use Trilogy at night, and some even during the day. You should see a lowering of your CO2 values and that will be a good thing! Trilogy is often referred to as a "non-invasive ventilator"; meaning that you control putting it on and taking it off. I understand your concern, but it's not necessary here. It will be a good thing.

Find another doc. If your saturation levels are below 88, you need supplemental O2. Not using it puts you at risk of developing right heart failure and brain damage. Find yourself a good pulmonologist for proper diagnosis, meds and treatment.

The Trilogy machine and O2 are meant for two different things. The Trilogy machine is prescribed for people who need to get rid of CO2; for those who are CO2 retainers. O2 is prescribed because the O2 saturation levels are too low to sustain the body properly. You can have a Trilogy machine and still use O2 with it. So it's not a question of which is better, it's a question of what problem are you trying to solve?

Any doc who really believes that O2 would be a crutch for someone with COPD whose saturation levels are regularly below 88 probably needs to go back to med school. Your body doesn't provide the O2 or produce it; you breathe it in from the air. For those of us with COPD whose lungs can't make the appropriate gas exchange: CO2 for O2, need supplemental O2. O2 is the ONLY medicine that has been proven to prolong life for people with COPD.

I had CPA’s then bi pap. Now I have trilogy. It is great

Thank you for this intelligent, informative answer! I am on oxygen 24/7, so anything I can learn about it is helpful.
Today I got a call from my pulmonologist's office, (following an appointment two days ago, which included testing), letting me know that I will soon need to switch from my bi-pap machine, (with an oxygen feed adapter), to a "ventilator" at night, with the oxygen fed into it. The word "ventilator" scares the $#@& outta me! The nurse explained that it isn't like the ventilator I'm thinking of, but still.... The reason is because my oxygen level is getting too low at night plus my CO2 is too high. Do you have any information on this? Thanks in advance for your time and help, even if it's just talking the time to read my wordy post. 😊

Some doctors hesitate to put you on oxygen due to your lungs don't work as hard and they feel it could be a crutch. It's always better if you can make your body provide the oxygen unless your lungs just cannot produce enough to keep your stats up.