great concept, but please tell me you didn't use aluminum foil for your ducting? you can get dryer vent tubing for cheap at walmart, and it's much less likely to leak. not to mention, it's more thermally efficient than aluminum foil.
ok you want an explanation, the computer is just to add weight to the kooler which will easily blow away, because the a/c vent is underneath, the vent umps the air through the duct through the wall into the grow room, happy man