AC Return

My 2nd flr unit does not cool as I expect How do I know if I have adequate return

In my daughters room there are 3 supply lines and no return you can feel lots
of air from under her door and pressure when you open it

I am thinking I am not getting enough return air, I am leaving her door open to see if it helps,


any way to tell?

If the supply pressurizes the room, you need to supply a return path. If you can duct it all the way back, you could put a pair of registers in the wall to get it back into the hallway where it may find its way back to the existing return, where ever it is.

its right in that hall