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Several of us on here have gone down the 'cool box' path and to put it bluntly they have a minimal and very short term effect. The only real solution is a cooled sensor but that is a bit more complicated to implement.
The problem with the cool box is the sensor heats up locally regardless and there is no effective thermal path for it to escape. Only a copper or Alum 'finger' parked behind the sensor can transfer sufficient heat away and maintain a reasonably even temp across the back of the sensor.
You might actually do better to buy one of the smaller OSC astro cameras and add your own peltier system. I modded my ASI 120mc quite effectively, the metal case is the key to it. I've since moved onto an 1600mm-cooled so it has been relegated to the guide scope without the cooler.
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