What should I do if water is leaking from the AC?

What water leaking from the AC usually means

An air conditioner removes humidity from indoor air, and that moisture is supposed to drain away through a condensate system. When you see water around the indoor HVAC equipment, dripping from a ceiling register, or staining drywall near the air handler, the problem is usually not “extra humidity” by itself. It means water is being produced normally but is not draining where it should, or ice formed on the indoor coil and is now melting into places the system was never meant to handle.

What you can tell from where and when the water shows up

A small puddle right next to the indoor unit after long cooling cycles often points to a clogged condensate line first. Water that appears with weak airflow, reduced cooling, or visible frost on copper lines strongly suggests the evaporator coil has been freezing and thawing. If the leak is coming through a ceiling below an attic unit, a rusted secondary pan, a disconnected drain, or a failed condensate pump becomes more likely. If water is near electrical compartments, furnace controls, or the disconnect, treat that as a stop-use situation because even a minor condensate leak can damage powered components.

Why this symptom should not be ignored

Unlike some AC symptoms that mainly affect comfort, a water leak can quickly damage floors, insulation, framing, and ceilings. Standing water around an air handler can also corrode blower parts, trip safety switches, or ruin electronic boards. If the source is coil icing, continuing to run the system can make the ice mass larger, leading to more water once it melts and making the underlying airflow or refrigerant problem more expensive to correct.

What a technician usually checks on this call

On an AC water-leak service visit, the contractor typically starts at the indoor unit and traces the entire condensate path: primary pan, secondary pan if present, drain trap, drain line, pump, and safety switch. They will also look for signs of coil icing, measure temperature split and airflow, inspect the blower and evaporator area, and determine whether the leak is simply a drainage issue or the result of a larger cooling-system fault. If the unit is frozen, a full diagnosis may need to wait until the ice has thawed, which can take several hours after shutdown.

What affects repair cost

The least expensive fixes are usually clearing a drain line, replacing tubing, or servicing a condensate pump. Costs rise when the leak has already damaged a pan, control board, insulation, drywall, or ceiling finishes, or when the real cause is evaporator freeze-up from blower problems or refrigerant loss. Typical 2025-2026 U.S. estimates are roughly $188-$607 for a basic drain-clearing or minor condensate repair, $188-$607 for pump or pan-related work depending on access, and more if coil-related diagnosis, leak detection, or water-damage repairs are involved.