Back in the late 80s- eary 90s, in Central Texas, we had the worst swarm of fire ants. Your weekends were spent killing mounds and everyday someone you knew - usually a child - would get viciously attacked, tens and twentys of bites.
They shorted our A/C contacts non-stop.
One strange thing I did notice during this explosion is that I’d find little mounds of dead ant bodies in places like the bathroom that grew. At night, I’d see maybe ten, then the next day the pile would be half an inch high.
I always assumed these were ant graveyards but maybe the ants were piling themselves up and dying.
Yes, we had lots of problems with fire ants getting into the AC contacts too. I finally put some (no longer available) ant killer into the contact box. That stopped them from shorting it out.
I heard Club Soda will kill fire ants. Just pour it onto the mound and it takes out all the oxygen so the ants die. I will try that this year.