Anything that will assist in the overall coolness of the inside of a case is a good thing.
Think u need to expand the description of the idea, perhaps with some kind of design of what ur thinking.
Something as simple as a Paint sketch would do it. That way peoples can see more precisely what ur intensions are and criticize either way.
At the moment, u`ve identified a perceived problem and described the tool, but I`m at pains to put the whole thing together in my head as to how the 2 are to be combined.
It`s an interesting thought mind u. As I said, anything that will help overall, even by a few degrees, is a positive.