Outside dimensions are 24"w x24"d x 42"h. I built it out of scrap 1/2" plywood, 2x4's, and 2x2's.
Temps are ok as long as the ac is on. If it dies like mine did this weekend temps will get out of hand. Almost makes me wish I'd gone with one of those big honkin envirolite cfl's. Almost. Ac will...