Fixing an Indoor-Dripping Window Air Conditioner

Condensation is a natural byproduct of how air conditioners work, but that water belongs outside, not on your carpet or windowsill. When a unit starts dripping indoors, it almost always means the internal drainage path is blocked by debris, mold, or a simple lack of gravity.

1. Kill the Power First. Disconnect the power cord from the wall outlet for safety. Locate the clips or screws holding the front grille in place and remove them to expose the interior drain channel.
2. Unclog the Hidden Port. Identify the small drain hole located in the bottom pan near the rear of the unit. Use a thin piece of wire or a pipe cleaner to push through the opening and dislodge any gunk or mold buildup.
3. Sanitize the Drain Line. Pour a small amount of diluted bleach or vinegar solution into the drain pan to kill remaining mold and rinse the line. Ensure the liquid flows freely out the back of the unit.
4. Angle for Gravity Drainage. Examine the unit from the outside; it must be angled slightly toward the outdoors. If it sits perfectly level or tilts forward, water will pool and spill over the interior frame.
5. Lock in the Right Pitch. If the tilt is wrong, loosen the mounting brackets and adjust the exterior support legs or window shims. Tighten everything securely once the proper backward pitch is achieved.
6. Seal All Air Leaks. Check the side accordion panels for gaps where warm, humid air might be entering. Use weather stripping or foam tape to seal these areas, preventing excess moisture from overwhelming the drainage system.