The double door is a "sealed" solid core. The HVAC is an independent system. We have a separate system for each floor as well as the theatre room.
Just trying to find that balance between cost and smart decisions since we are in the build process. All we have on site right now is the footings and basement walls poured. Framing won't even begin for about 3-4 weeks.
If I didn't have to have an insane garage and workshop built down on the basement level (I'm a car nut), the theater would have gone down there and I wouldn't have to worry nearly as much about this as I do with it on the same level as the boy's rooms.