AC Leaking Water in Orlando: Causes and Fixes

How condensate is supposed to leave your home

Warm, humid indoor air passes across the cold evaporator coil, moisture condenses on the fins, and the water runs down into a primary drain pan. From there it flows by gravity through a trapped PVC drain line to an exterior termination, a plumbing connection, or in some installations a condensate pump.

Attic and closet installations usually add a secondary safety pan and a float switch. The switch is a safety device: when water rises where it should not, it interrupts the low-voltage control circuit and shuts the system down before water reaches the ceiling. A system that keeps shutting off in humid weather may be telling you the drain is failing, not that the thermostat is broken.

Why drain lines clog so reliably here

Condensate drains are wet, dark, room-temperature environments. Biological slime forms readily inside them, and it combines with dust that gets past the filter to form a plug. In a climate with a long cooling season, drains run for months at a time, so buildup accumulates faster than in regions where systems idle half the year.

• Biological growth inside the drain line and trap
• Dust and fiberglass debris washed off a fouled coil
• Flat or improperly sloped drain runs that hold standing water
• Insects and lizards entering an unprotected exterior termination
• Missing or dried-out trap allowing air to break the flow
• Crushed or kinked flexible drain tubing in a tight closet

Drain clearing and treatment is standard scope during AC maintenance, and it is one of the highest-value preventive tasks in this climate specifically because a $200 drain issue can become a drywall and flooring claim.

Drain pan problems and rust-through

Primary pans are metal or molded plastic. Metal pans sitting under a coil for fifteen years in constant moisture eventually corrode, and a pinhole is enough to drip continuously onto whatever is below. Plastic pans crack, especially at the drain fitting where they were over-tightened.

Pan replacement on some equipment requires removing the evaporator coil, which turns a small leak into a substantial labor job. That is one reason a persistent water leak on aging equipment can shift the conversation toward AC replacement — not because a pan cannot be replaced, but because the labor overlaps heavily with what a changeout would involve.

When water means the coil froze

A large, sudden puddle after the system was shut off is a classic signature of a coil that iced up and then thawed. Ice holds far more water than the pan and drain were sized to handle, so the melt overwhelms the drainage path and spills.

If that is what happened, the water is a symptom and the freeze is the actual fault. Chasing the puddle without fixing the airflow restriction or refrigerant problem behind the freeze guarantees a repeat. See frozen AC coil for what causes icing and what to check.

Humidity, duct sweating and leaks that are not drain leaks

Not every water problem originates in the drain. In humid conditions, uninsulated or poorly insulated ducting, plenums and refrigerant lines can sweat heavily enough to drip and stain ceilings. Homeowners often describe this as an AC leak, and functionally it is — but the fix is insulation and vapor sealing rather than drain work.

Two clues help distinguish them: sweating is usually spread along a duct run rather than concentrated at the equipment, and it worsens on the most humid days rather than during the longest run times. A technician checking supply air temperature, duct surface temperature and indoor dew point can separate the two.

What repair typically involves

1. Confirm the source: primary pan, secondary pan, drain line, pump, coil freeze or duct sweating
2. Clear the drain line and trap, then verify flow with water rather than assuming it is open
3. Test the float switch and confirm it actually interrupts the control circuit
4. Inspect pan condition, slope and seal at the drain fitting
5. Check filter and coil cleanliness, since debris washing off a coil re-clogs a fresh drain
6. Verify condensate pump operation and check valve where a pump is used
7. Evaluate whether the drain layout itself is contributing — flat runs and missing cleanouts cause repeat calls

Simple drain clearing generally lands in the lower planning band; pan replacement, pump replacement and re-piping move higher. Model the scenario on the AC repair cost page.

Protecting the home while you wait

• Switch the system off at the thermostat — no run time means no new condensate
• Place towels and a shallow container under an active drip, and move stored items out of the closet
• Do not push wire or coat hangers into a drain line; it can puncture the pan or the line
• Do not disable or jumper a float switch to keep cooling running — that switch is the only thing standing between a clog and a ceiling repair
• Photograph the water location before cleanup; it helps the technician understand the path