After I grew aeroponic cannabis in a low pressure system on 2 30 site tables I made out of $50 worth of pvc/fittings/sprayers and some panda film and flexible drainage pipe for the return for 2 1000w lights I watercooled by making a plexiglass tube and running spaghetti lines to it from a 35gal res that was in turn cooled by an ac which I dipped the cooling element in the water from, the only reason I would grow indoors would be for that(illegal), otherwise I think it's just a hobby (notwithstanding I made a bit of profit) and would rather spend the electric to learn about permaculture and biodynamics.