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I can second this!
In my own experiments with cooling a ZWO ASI120MC (which conveniently outputs the sensor temperature, so you can see whether your mods have any effect where it matters - at the sensor), I tried passive aluminium heat sinks of this type on the back of the camera (no discernible effect), heat sinks of the same type with a fan (a small effect, but not enough to be with the effort) and a Peltier TEC with both a passive and a fan-cooled CPU heat sink, which can easily get me a Delta T of 20 degrees Celsius or more, and a dramatic reduction in sensor noise
The Peltier TEC with a fan-cooled heat sink is the way to go!
(Now to solve the dew issue which arises in warm humid conditions when your camera body temperature drops to 4 degrees Celsius!)
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