AC Leaking Water Inside? Causes & Fixes
Water pooling around your indoor AC unit or dripping from vents is a common problem that can cause water damage, mold growth, and indicate system issues that need attention.
Signs & Symptoms
Possible Causes
- -Clogged condensate drain line
- -Cracked or overflowing drain pan
- -Frozen evaporator coil (ice melting)
- -Improper installation
- -Disconnected drain line
- -Dirty air filter causing freeze-up
- -Low refrigerant causing freeze-up
- -Damaged or rusted drain pan
DIY Troubleshooting Steps
Try these steps before calling a professional (unless it's an emergency):
- 1Turn off AC to prevent water damage
- 2Check and replace dirty air filter
- 3Locate drain line and check for clogs
- 4Pour 1 cup vinegar down drain to clear minor clogs
- 5Use wet/dry vacuum on drain line outlet
- 6Check drain pan for cracks or rust
When to Call a Professional
- !Water leak continues after clearing drain
- !Drain pan is damaged or rusted through
- !Coils are frozen (indicates other issues)
- !You can't locate the source of the leak
- !Leak is causing ceiling or wall damage
- !AC won't restart after cleaning
Estimated Repair Costs
Diagnostic: $89-$129
Minor Repair: $100-$250
Major Repair: $300-$800
Drain cleaning is minor. Drain pan replacement or refrigerant issues are major repairs.
Prevention Tips
Frequently Asked Questions
Why is my AC leaking water inside the house?
The most common cause is a clogged condensate drain line. Your AC removes humidity from the air, which normally drains away. When the line clogs with algae or debris, water backs up and overflows.
Is a leaking AC dangerous?
While not immediately dangerous, water leaks can cause significant damage to your home including mold growth, ceiling damage, and electrical issues. Address leaks promptly to prevent costly repairs.
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