Those are the most common non portable type for daily home use. The other options, I believe are tanks that require filling but depending on how much O2 he's on, you're going to have numerous tanks, big ones too. You might ask about liquid O2 and if it's a feasible option for his needs. We did exactly what you did. When my daughter was here at home, we put the concentrator in the hallway. When she was in her own apartment at school, we put it in the closet with the door ajar to provide airflow. When we relocated to CA for transplant, we used the really super long tubing and put it in the other bedroom with the door shut. BTW, you get used to it but first you have to get past the anger of having to be on O2, if he has any, my daughter did... well perhaps frustration is a better word or both. We used liquid O2 for portable oxygen when her needs exceeded the portable concentrator we had purchased her. She had an Eclipse for a short while but it wasn't small enough for her, she didn't like pulling anything around and the liquid oxygen was in a much smaller carry case. Keep in mind you can not take liquid O2 on an airplane, if you travel. I hope some of this is of some help.