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I always used to warm up my ASI1600, using SGP warm up cycle, as part of the shut down sequence. It could run while I parked the scope and closed up the observatory. I did this for years. As I understand it, the thermal shock was mostly related to the mounting of the TEC to the Sensor, and TECs do not equalise gradually without power regulation and air flow to the heatsink. For what it's worth, I usually ran at -17C, in other words, if you have deep cooling you might as well use it.
I used a higher warm up end point temperature, depending in the Night time temp but often 12C, on the basis that shut off at lower temp could encourage condensation.
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