I know that the MBP unibody acts as heat sink. I have the speck case. It covers the entire under-body and screen-back of MBP. Does it resist the cooling process???

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Does Speck Case heat up the MacBook Pro?
Does it resist the cooling process???
No. It's just a case; it has no capacity to generate its own heat to transfer to the Macbook Pro and "heat it up."
Obviously yes, because plastic is an insulator.
So, should I use it or not?
The good part is is that Speck cases has a vent which can release heat produced by the MBP
If you aren't doing intensive applications that will cause the fans to turn on, then yea, I don't see a problem.
If you don't yet, get smcFanControl and see how the temperature is when you're using the computer; if you never (or rarely) hear the fans on your computer now, chances are you won't have a problem.
That doesn't help the restriction it puts on the unit as a whole to help dissipate heat. The aluminum conducts heat and helps cool the system. Putting plastic on it keeps that heat in. Kind of like... wrapping your body in plastic but leaving your head open to sweat. Your entire body sweats, not just your head.
I'm sure it does do produce a bit of heat, because it is an enclosure.