I like your thinking man. I have been battleing temps in my veg as it has no AC but just fluro's.and good vents. Still you can't get any lower than the outside temps. latewood and I were talking of running 100 foot of line through a real small fridge and pumping through that to keep temps down. Problem is I can't put any more draw on my eletric at the moment. I do have an ice maker that makes 165 pounds in 24 hours. I have 2 , 10 gallon tubs for veg. All I need are larger tubs and some pvc to drain the water out. Kind of like keg coolers. Man I will try , it's a bit of work but I can handle that just not the electric. Try your way and we will see what turns out. IT's easier to try than to prove it can't be done