I know that the post has to do with a residential issue but I think the inspector should rethink his call. Fire alarm systems unlike single station smoke alarms have a much better alerting system that you might think. If you have off site monitoring there is notification off site and on site. that not only goes for loss of A/C but also low battery plus other troubles. And if you take a lesson from the non-residential fire alarm installations, it will and should be on a dedicated circuit with nothing on it but the fire alarm system with a locking device on the breaker handle and no gfci or afci protection.
