well sometimes the "hillbilly way" is the only affordable way to try and accomplish something and with the way money is these days not to many peeps have a roll of extra cash in their sock. As for the roots being toast if they touch the bottle, use a lil time and create a screen or something that will keep roots off bottle but not restrict water flow. Light colored buckets is the first and easiest step which I mentioned in my first post. If these thoughts dont sound like they will work then the sure fired way to fix the problem is to completely seal room and install an A/C unit just for that room but hell I dont carry an extra $200 around but if you do go for it :thumbsup:
I also have DWC running here and my temps in buckets runs right about 76 and never have had a problem with root rot.

Just my thoughts have a nice day