Insulating effect of carpet vs linoleum.

I am getting near the point of having to decide what type of flooring to install on the concrete slab in my basement addition. Ignoring for the moment other considerations such as durability, I'm wondering about the 'heat sink' effect of the slab, and whether carpeting will have an effect. I seem to recall that at the time the Title 24 calcs were done, being told that an exposed slab, would have a positive effect on the calcs, but a carpeted floor wouldn't figure into the equation.
This addition is in the half of the basement area that wasn't already a finished room. The pre-existing half does have carpet, and in the hot weather we are currently experiencing, I'm noticing that the new room does stay cooler than the pre-existing room.... (I don't have a/c for the lower half of the house). I would like to keep it that way, and am wondering if carpeting will have a noticable effect. My alternative to carpet would be real linoleum, which I'm assuming would have a very limited, insulating effect.
Would appreciate any comments, especially from those who do title 24 calcs for a living.
TIA Kevin
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