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I don't recall my engine ever starting up at a traffic light to provide power for the A/C, or for any other reason, so whatever buffer they have for that seems to last through traffic lights, at least in my experience.
Stoplights aren't that long, regardless of how they seem.* The buffer at CS mode is big enough to power the heating for about five minutes at full blast from engine shutoff to needing to start it again, and if the cabin is already comfortable, it could easily manage 15 minutes.

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* Generally accepted traffic planning has signals change from red after no more than 100 seconds and between 60-90 seconds are recommended from a side street into an arterial.
 
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