Think this will work?

Sup guys,
I've been thinking about growing for a while. I didnt last year but im set on doing it this summer. Indoor seems to be my only option. Ive looked around the house and since stealth is pretty important ive found only one possible growing situation. At first i thought in my attic would be perfect. But now that i think about it this might not work out. See my attic gets really hot in the summer. Even hotter then the temperature outside. Theres only one other secure place and its in the trunk of an old car in my garage. But this would only work for a little bit until they get bigger. Eventually i would have to bring them to the attic. Is there any way to keep the temperature down. I figure with the heat in the attic and the lights it would kill the plants. Im going to put a ventilation system in the box but something tells me it wont be enough.

Maybe the temp wont be a problem. This is my first grow so obviously i wouldnt know. Is this hot attic situation going to screw with my plants? If so any suggestions on how to keep them cool?

Thanks for your help!