If your room is about to get hotter in the coming months then you may want to think about a AC unit. They have some that you may be able to vent right into your box with a few modifications.
I know what your going threw, had to play the modification game for about a week when putting the 1000W in a cabinet, wasn't fun to think that I could have wasted so much time, money and effort, but it paid off at the end.
Good luck
Adieu