Hell yeah, just like Widow said. One or two CFls make almost no heat and will give plants a nice jumpstart. I used a rubbermaid bin and 2 cfls with a 3" computer fan for exhaust. I cut a 3" by 3" hole in the top left, and stabbed a couple holes in the bottom right side to act as passive intakes. Then I just shoved the whole setup in my closet and tucked the wires into the carpet along the wall.