The things I notice about your set-up...
A) Everything in your growroom will hold excess heat. (Boxes, plastic stuff...) Especially if blocking airflow.
B) Anything electrically powered will add heat.
C) A tad extra humidity is provided by the grow media, and also transpires from the plant itself.

I believe that a more unobstructed airflow is preferable to all that stuff in front. If you keep the door open, try placing a fan outside the room, (close to the floor) pointing the main focus of the breeze between the light and the top of the plant. (a slight upward angle will help blow the heat upwards, instead of just blasting it against the walls) If necessary, possibly a fan up top blowing hot air out of the room would help, too. If need be, could always place thre humidifier behind the fan.