The room was supposed to be a bathroom in the basement(basements rule.) The light was cheaper. hehehehehe. The room is about 5 w x 12 d. All passive air. Vents at top and vents on bottom from storage room. I've been leaving the door wide open all the time the lights are on. (The storage room is dark, don't worry)The rooms attached to a storage room about 12x24 with 2 windows I keep open. I have an oscillating fan blowing 24/7. If I close the doors the temp goes to about 84 with the lights on. (Great lamp). Night temps about 68/74. Next time. Can fan/carbon filter etc but let's see what I get from this.