AC leaking water in Herndon, VA

An AC leaking water in Herndon, VA is one of the few HVAC problems worth acting on the same day — not because the AC itself is at risk, but because the water usually is dripping somewhere it shouldn't be.

Where the water is actually coming from

• Clogged condensate drain line — algae and dirt build up over a cooling season and back the line up (the single most common cause)
• A failed condensate pump on systems where the drain can't run downhill to the outside
• A frozen evaporator coil thawing out and overflowing the drain pan faster than it can drain
• A cracked or rusted-through drain pan on an older system
• A drain line installed with the wrong pitch, so water pools instead of flowing out

A lot of Herndon homes run the air handler through the attic or a closet above living space — if that's your setup, a slow drain leak can go unnoticed for weeks and show up as a ceiling stain before anyone realizes the AC is the cause. Worth having it looked at even if the leak seems minor.

What to do right now

If you can safely reach the system, turn it off at the thermostat until a technician can check the drain line — running it while backed up just adds more water to whatever's already collecting. Don't ignore a slow drip hoping it stops on its own; condensate lines that clog once tend to clog again.

Herndon HVAC contractors who handle drain and leak issues

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