You can also look into getting another sliding door where you can make intake and exhaust holes. Sometimes you can find them in second hand shops for cheap. Then you can run a 250w or 400w HPS with a cooltube and fan. I managed to keep the temps just in range, at about 85 F, with a 400w HPS, cooltube, carbon filter and 129 cfm fan in a 22.5in x 22.5in. x 67.5in. closet. :thumbsup: