Why it matters to you
In Houston homes with attic air handlers, the float switch is often the only thing between a clogged drain line and water damage to the ceiling below, so an AC that suddenly shuts off on a humid day may be doing exactly what it should. Repeated trips can also look like short cycling.
Practical guidance
If the AC stops and you see water in the drain pan, switch the system off at the thermostat and call a technician; never bypass, tape down, or remove a float switch to get cooling back. During maintenance, ask whether your system has float switch protection and whether it was tested.