ive thought of an idea too, you know how you said you used the fan and the cool air form the night with the help of a shroud, this is darn near exactly what ive been telling kilo and twistdid, except, you don't use a window, you use an air conditioner, you could still let it fill the room but put a tube on one of the sides, and hook it up to the side case, where the processor draws air from the outside, then its getting constant cold air 8^)
whenever i get an air conditioner and i move my desk somewhere near the window ill do it and show you some statistics, yup yup, i can revive the dead thread 8^)