I don't think it would.. I run my lights something like 19/5, and even w/ the lights out, the basement doesn't get cooler than low 60's, which is definitely fine IMO.. I could change the lighting cycle to stay on overnight when the temps drop the lowest, as I did this last winter with decent luck, but I was doing hydro, so it's a little different animal.. I had considered putting my heat mats in there if temps got too cool during the worst of the winter months, mostly because they are low wattage, but would keep the root zones in a good temp region..