A June HVAC landing page for AC water leaks, clogged drain lines, frozen coils, and repair-cost next steps.
Quick Summary
Likely answer: Most AC leaks come from a clogged condensate drain, dirty filter, frozen coil, damaged pan, or condensate pump issue.
Typical cost range: Drain clearing may be relatively modest; coil, pan, pump, or refrigerant-related repairs can cost several hundred dollars or more.
Next comparison: Compare whether the leak is a drain issue, frozen-coil issue, or equipment repair issue.
Cost and Decision Table
| Scenario | Estimated Range | Urgency | What It Means |
|---|---|---|---|
| Clogged condensate drain | $100-$300 | Medium | Most common indoor leak source. |
| Frozen coil or airflow restriction | $150-$650 | Medium to high | Often tied to filter, coil, or refrigerant issues. |
| Drain pan, pump, or refrigerant issue | $350+ | High | Can create repeat leaks and water damage. |
The Drain Line Is the First Suspect
Central AC systems remove humidity from indoor air. That water should exit through the condensate drain. If the line clogs, water backs up around the air handler.
Frozen Coils Can Look Like Leaks
When ice melts off the evaporator coil, it can overflow the drain system. Weak airflow and refrigerant issues are common reasons coils freeze.
Water Damage Changes the Economics
The AC repair may be simple, but ceiling, drywall, flooring, or mold-related damage can make the total problem more expensive.
Mistakes to Avoid
Only wiping the water without finding the source.
Restarting the unit repeatedly after the float switch trips.
Assuming every leak is only a drain clog.
Ignoring ceiling stains below an attic air handler.
Waiting until water reaches flooring or drywall.
FAQ
Why is my AC leaking water inside?
The most common cause is a clogged condensate drain line, but frozen coils, dirty filters, damaged pans, and pump issues can also cause leaks.
Is an AC water leak urgent?
It becomes urgent if water is near electrical parts, damaging ceilings or walls, or the system keeps shutting off.
How much does AC leak repair cost?
Drain-line service may be lower cost, while pump, coil, pan, or refrigerant-related repairs can be several hundred dollars or more.
Can a dirty filter cause leaking?
Yes. Restricted airflow can contribute to coil freezing, and melting ice can overflow the drain system.
Should I keep running a leaking AC?
If the leak is recurring, near electrical parts, or causing property damage, stopping the system and comparing service options is safer.