AC leaking water inside: what to do

Your AC removes moisture. That water needs a clear, working way out.

The answer in 2 lines. Turn the AC off when water starts leaking indoors. Protect the floor if you can do so without approaching wet electrical equipment, and photograph the leak. A blocked condensate drain, a drainage defect or melting ice may be involved. Inspect only the filter and other parts identified for homeowner maintenance. Don't open a ceiling unit, bypass an overflow switch or keep restarting the system. If the leak continues or returns, arrange professional service.

Start here

Stop cooling. Use the thermostat or remote only if it is safe and dry. Water may continue dripping after shutdown.
Protect the room safely. Place a container under the drip and move belongings away without touching wet cords, outlets or appliances.
Document what you see. Photograph the source, water stains and any visible ice. Inspect the user-accessible filter with the equipment off.

Stop: danger

Water touching electrical equipment: keep people away. Switch off the affected circuit only if the panel and route to it are dry and safe; otherwise get professional help.
Smoke, sparks or suspected fire: leave the building and call 911. Don't touch the leaking appliance.
A bulging or sagging ceiling: keep everyone out from underneath it. Don't enter an attic or climb toward damaged materials to inspect the air handler.

What the location can tell you

Water below a central air handler: the condensate pan or drain may not be carrying water away. Have the drainage system inspected.
Drips from a wall-mounted indoor unit: a drain obstruction or installation problem is possible. Don't detach the unit or pull its tubing.
Ice followed by a puddle: thawing ice may be contributing. A restricted filter can cause freezing, but other faults require testing.
A window unit leaks toward the room: mounting or drainage may need correction. Follow the model's installation instructions; don't drill the casing or improvise a tilt.
A portable unit reports a full tank: consult its instructions for the designated drain and safe emptying procedure. Keep the plug and outlet dry.

These clues help describe the problem. They don't establish which part has failed.

What not to do

Restarting the AC repeatedly because the floor has temporarily dried.
Bypassing a condensate overflow switch or other protective control.
Pouring bleach, drain cleaner or another chemical into an unidentified opening.
Pushing wire or compressed air into an unfamiliar drain assembly.
Leaving a bucket as the permanent solution while walls, insulation or flooring remain wet.

What a service visit should address

Ask the technician to identify where water is escaping and why. Depending on the system, the inspection may include the cooling coil, drain pan, drain line, pump if fitted, insulation and overflow protection. Request an explanation of the repair and confirmation that drainage works afterward.

The Minnesota Department of Commerce maintenance sheet separates homeowner tasks from technician checks. Use its indoor-unit section to discuss the coil, pan and drain during a service visit. It is maintenance guidance, not a nationwide legal inspection schedule.

If the problem began after installation, contact the installer with photos and your paperwork. Ask which written equipment or workmanship warranty applies before authorizing additional work. Don't assume a particular nationwide warranty period.

After the water stops

Dry affected materials promptly and check nearby surfaces for hidden dampness. Fixing the drip doesn't dry wet insulation or the inside of a wall. Read the EPA home mold-cleanup guidance to decide when professional cleanup is appropriate. If contamination inside the HVAC system is suspected, leave it off pending assessment.

Renters should report the leak and damage in writing to the landlord or property manager. Responsibility and remedies depend on state and local rules and the lease. Follow the state-agency link on USAGov's tenant-rights page before deducting repairs from rent. If belongings or the building are damaged, notify the relevant insurer and ask what documentation it needs; coverage depends on the policy and cause.

Good to know

Condensation is expected during cooling, but water escaping into the room needs attention.
Not every system has the same drainage arrangement. Identify your equipment before attempting homeowner maintenance.
If refrigerant testing or charging is proposed, ask for an appropriately certified technician and a diagnosis rather than assuming water means low refrigerant.

Illustrative example: In Atlanta, Jordan sees water spreading below a hallway air handler. He stops cooling, keeps the nearby outlet clear and sends photos to the property manager. A technician finds a blocked condensate drain, restores drainage and checks the overflow protection. The wet surrounding materials are assessed separately.

A made-up story, for illustration.

Bobby

Sources, verification, confidence

Verified on November 5, 2026, for the United States. Confidence: high for stopping the leak safely, maintenance boundaries and moisture control; medium for possible causes, which require inspection. Installation requirements, rental duties and insurance coverage depend on the circumstances.