Hi i am a newbie and have some ventilation questions.

I have a cabinet setup which is 500x500x1500 and it is located in the addick and the roof is made out of tin but is half connected to a garage without the addick.

I am running 1 6400k cfl with a reflector and i am installing 4x 120mm pc fans and a small oscillating fan for some added air movement.

In my area it can get over 40 degrees celcius or roughly 104 dergrees F and i am wondering if there are any other ways of keeping it cool. I was thinking one way of insulating it could be styrofoam with mylar covering that or alfoil.

It is also a stealth project and is visible from the garage level, its just noone goes up there and as long as no light gets out i should be sweet.

any help would be appreciated greatly

Also how many plants am i able to fit in the 500x500x1500 room?