How to cool 2 rooms with 1 AC

I have a closet that measures 8'x2'x8' I am going to split it into 3 space. Two rooms that measure 7'x2'x4' one for vegging and one for flowering and one that measures 1'x2'x8' too keep my AC/timers ect. All walls are made with black plastic. I am using a 9500btu portable AC unit and want to use it to cool both the vegging and flowering room but I cant have light travel between and of the rooms for obvious reasons what is going to be the best way to allow cold air to enter each room without letting light from either room interfere with my plants grow schedule? Ive attached a drawing of the grow room design

just create some opening from each room to the area with the ac in and you should be fine. Maybe put alittle fan infront of each opening to help pull the air in.