Welcome!
I'm sorry I don't have any experience with residential treatment facilities, but I have a few questions for you. Your answers may help us point you in the right direction for help.
What kind of doctor diagnosed your difficult child? What kind of doctor is treating him? Is he in therapy?
When was the last time he was evaluated? Has he ever undergone neuropsychological testing?
Is he taking any medication? If so, what?
I assume he has an IEP for school? Have you tried to get him placed in a residential treatment center through the IEP process? Have you tried to locate an advocate to help you with this process?
Again, welcome. Weekends tend to be quiet around here, but others will be along shortly to offer their advice.