I have the same closet and it work perfect if you have perfect ventallation. I have a 150cfm fan at the top blowing out the heat and another 150 at the bottom to blow cool air in, I also cut out a few 4 inch cirlces near the bottom for more air flow. Its good anough to keep a 400 hps near 79 degrees and on a real hot day the ac is on. ollie