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Have a look at the Dark current graph provided by ZWO
At -20C dark current is extremely low on this camera so -15C would be an acceptable level , although it all depends on the ambient outside temperature of your imaging location summer and winter.
My 2600MC cooling set up ......
Sydney summer I can get down to -12C on most nights but I had some really warm nights where it stopped at -10C or -11C
Sydney winter I run at -15C no problem
South coast NSW summer I get down to -12C no problem
South coast NSW winter I run at -15C
I suspect in colder climates around the country -20C would be achievable but not absolutely necessary
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