I don't think the case material will have much effect on operational temperature, but I think you have the effects reversed. A metal case will not be colder than a plastic case (assuming the device is exposed to the environment long enough for temperature to normalize.). The aluminum feels colder to your hands because it conducts/leaches the heat out of your hands faster. If anything, that will tip the balance in your favor... (more heat leaching from hands means screen and electronics are kept warmer._
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