I once bolted a huge heatsink fan peltier combo to the base of a DSLR and soon discovered that if there is any chance of condensation or deposition, no matter the temperature, the camera will eventually stop working.
No matter how you intend cooling you must first protect the electronic components, which requires disassembling and applying water repellent in all the right areas.
Or use a dry air or Argon filled cooler box.
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