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I 've read multiple threads about this. What is opinion on leaving the AC as we wait inside during charging? I believe people are worried about the heat that it generates. So if the battery gets too hot does it decrease the longevity of the battery? I would normally remain in the car with the AC on while charging.
 

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Not exactly an option where I live unless you thrive on saunas. I believe AC works less hard to keep something cool than to cool it down after it gets hot.
 

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So if the battery gets too hot does it decrease the longevity of the battery?
Yes, but the battery will not get too hot since the ID.4 has a very good BMS and cooling system to protect from that. The BMS slows down the rate of charge if the battery gets hot and the AC cannot cool it enough, so the drawback might be a slower charge rate when near full charge if you have the AC on while charging. From 80-100% charging is when the battery makes the most heat, and why it always charges slower at that level.
 
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