I have hard wired smoke detectors. I've noticed that when I plug my tablet into a power strip connected to an outlet in my living room it caused the upstairs detector to emit a quick beep.
I now have an air conditioner in the same outlet. Whenever it kicks on, the detector on the same floor and upstairs would beep.
Tonight while it was running we started hearing a continuous quick beeping; it was the detector in the basement. As soon as we switched the ac off, it stopped.
It seems that whenever there's a quick rise in power usage, these things react.
Any idea what is going on?