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    If you aren't running any other current-hungry peripherals e.g. motors within the enclosure, you won't need a fan or other cooling, for a typical (not hyper-insulated) enclosure. Commented Feb 12, 2014 at 7:52
  • The biggest heat culprit on the Uno would be its internal voltage regulator(s). If you can power 5V from an external regulated source it will keep things cooler in the box. Especially if you have a horde of sensors drinking power from the Uno board. Commented Mar 11, 2014 at 13:14