Passive Cooling - soaker hose on roof?

[Hotzcatz]

If it is a rental move somewhere that works for you. Is his bedroom on the sunrise side of the house? If it starts out with the afternoon heat already in his room it will be more difficult to cool it.

Wait until the evening air cools down and then open all the windows, turn on some fans and ventilate the room for fifteen minutes to cool it down then shut all the windows.

Open the windows and wear earplugs.