Your AC wrings gallons of water a day out of Gulf air, and all of it leaves through a slim PVC drain line. That line grows algae enthusiastically in our climate; the clog builds silently until the pan overflows - usually into an attic, through a ceiling, at the height of summer.
Know three things about your system: where the drain exits outside (watch it drip on a summer day; no drip plus running AC is a warning), whether a float switch is installed in the pan (it shuts the unit off instead of flooding), and where the cleanout tee is for flushing.
The maintenance rhythm that works here: flush the line at the spring tune-up, verify the float switch by lifting it, and treat 'the outside drain stopped dripping' as a same-week call. The parts involved cost almost nothing; the ceiling they protect does not.
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