Condensate Drain
The small line that carries away the water your system produces — condensation from the AC coil in summer, and (on high-efficiency furnaces) acidic condensate from combustion year-round. Clogged condensate paths are the quiet cause of summer water stains and shutdowns.
The longer answer
Cooling dehumidifies: warm air crossing the cold evaporator coil drops gallons of water on humid days, all of which must drain. Algae and dust clog these lines gradually; overflow switches (where fitted) shut the system down to protect your ceiling — a 'mystery no-cool' with a very findable cause.
Condensing furnaces and ductless heads have their own drain paths with the same failure mode. Drain flushing is standard tune-up scope, and a head dripping down the wall is a service call, not a system verdict.
Where this decision happens
Nearby in the glossary
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