Ok, so I started looking into cooltubes and they don't seem too difficult to build. I've seen large diameter polycarbonate tubes at hardware stores and I was thinking about mounting 2 smaller fans on either side of the tube and venting air in and out. They intake air can be as cold as I want because I dont pay for a/c or electricity :thumbsup:

This would of course mean that the tube is stationary and I would have to raise the plants up off of the floor. I have 2 adjustable tables that would do the job I think.