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us Home & property emergencies indoor ac leaking water • air conditioner dripping inside • ac unit leaking water indoors • mini split indoor unit leak • wall ac dripping water • central ac water leak • condensate drain clog • overflowing drain pan • ac leak near electrical outlet • water coming from air handler • ac leaking through ceiling • hvac dripping water • unexpected ac leak • ac leak after running • ac leaking at night • ac water damage risk • wet carpet from ac leak • ac drain line overflow • dripping evaporator coil area

What to do if…
an indoor air-conditioning unit starts dripping water or leaking unexpectedly

Short answer

Turn the AC off and keep water away from electricity, then contain the leak and contact a licensed HVAC professional.

Do not do these things

  • Don’t keep the system running to “dry it out” — overflow can worsen quickly.
  • Don’t touch wiring, open panels, or work inside the unit while it’s powered.
  • Don’t use extension cords or power strips on a wet floor or where water could drip onto them.
  • Don’t attempt refrigerant work yourself; in the U.S., refrigerant handling is regulated and requires certified technicians.
  • Don’t leave wet materials sitting — moisture left in place can lead to mold and structural damage.

What to do now

  1. Turn the system off at the thermostat. If water is near electrical components (outlets, the air handler, a furnace, breakers), shut off power to the HVAC equipment at the breaker panel if you can do so safely (dry hands, dry footing).
  2. Treat electrical danger as an emergency. If you see sparking, smell burning, or water is actively entering an outlet/electrical box and you can’t safely shut power off, stay back and call 911 (or your local emergency number).
  3. Catch and contain the water immediately.
    • Place a bucket/tray under the drip.
    • Use towels to stop spread; put plastic sheeting under towels to protect floors.
  4. Protect the building for the next hour.
    • Wipe up standing water promptly.
    • If water is dripping through a ceiling or you see a bulge, keep the area clear beneath it and move valuables away.
  5. Do two safe checks that don’t involve opening equipment panels:
    • Look for an obvious kink/disconnection in any visible condensate drain tube (where it runs to a drain/exit), if accessible.
    • If you have a standard replaceable return-air filter in a simple slot (not behind a sealed service panel), check whether it’s extremely dirty and restricting airflow; if so, plan to replace it soon.
  6. Call the right help.
    • If you rent: notify your landlord/property manager right away and report “active AC water leak causing potential water damage.”
    • If you own: call a licensed HVAC company. If refrigerant work is needed, technicians typically need EPA Section 608 certification for regulated refrigerants.
  7. Reduce mold risk by drying promptly. Increase ventilation and run fans if it’s safe to do so. If carpet/underlay or drywall is soaked, professional drying may be needed to prevent ongoing damage and mold.
  8. Document the situation. Take photos/video of the leak path, any damage, and the unit model/serial label (without opening panels). This helps both the technician and any insurance claim.

What can wait

  • You don’t need to pinpoint the cause right now.
  • You don’t need to disassemble the indoor unit or flush drain lines during a panic.
  • You don’t need to decide on major repairs or replacement today — stop water damage first, then get a proper diagnosis.

Important reassurance

Indoor AC leaks are common and often come from condensate drainage or airflow issues. Turning the system off and preventing water from reaching electricity is the safest first move.

Scope note

This is first steps only — an HVAC professional may need to inspect the condensate drain/pan, pump (if present), coil condition, airflow, and any refrigerant-related issues.

Important note

This is general information, not professional electrical or HVAC advice. If you can’t safely shut off power or water is contacting electrical equipment, prioritize safety and get urgent professional help.

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