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My experience with ZWO colour and mono versions of the 1600.
Any subs captured below 0C were pretty good. If your really concerned, grab the histogram for a sample of them and zoom in on the left side (where noise gives way to signal). I was using SGPro mostly for imaging software.
One trick for improving sub temperature stability, is to build in a cool down period between subs. This obviously extends session times but can over come weak cooler performance. One thing I tried, in summer, was piggy backing a laptop fan over the ZWO fan (as a boosted fan), that seemed to add -5C to the bottom end, depending on ambient temps at the time. It has been my view that ZWO doesn't design cooling for Australian summer evenings.
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