Winter Heat Suggestion Needed!

Hey guys, So i have a small box in my shop (4x3x3h) that I currently have one plant growing, ready to bud, now under about 10 23w cfls. My problem is that this shop is unheated so I need to maintain heat when lights are off during budding. So I thought of building a smaller veg box (3x3x3?) and switching to HIDs. So i figured i could run the MH light (prob 250w) in a cool tube that runs directly into the bud box to provide heat when the light in there is off. Then I'd probably move the cfls to the veg box (maybe not all of them). Then I'd just time the exhaust fan to periodically expel the old air. Does this sound like it will provide enough heat? The box maintains a nice 80 degree temp with just the cfls (with a blanket over the box) even during night time room temps of 40-50 degrees, which will get much much colder in the coming months. Any suggestions or tips?? Thanks !! -Dr Robudnik.
 
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