Finding a puddle of water around your indoor AC unit is alarming — and for good reason. Water leaks from your air conditioner can damage floors, walls, ceilings, and create conditions for mold growth. The good news is that most AC water leaks have straightforward causes that a professional can fix quickly.
Why Your AC Produces Water
Your air conditioner removes humidity from the air as part of the cooling process. Moisture from your indoor air condenses on the cold evaporator coil — just like water droplets forming on a cold glass on a humid day. This condensation drips into a drain pan and flows out through a condensate drain line, usually to the outside of your home.
When any part of this drainage system fails, water backs up and leaks inside your home.
Common Causes of AC Water Leaks
Clogged Condensate Drain Line — This is the most common cause. Over time, algae, mold, and debris build up inside the drain line, creating a blockage. Water backs up into the drain pan and overflows. Georgia's humidity makes this problem especially common.
Cracked or Rusted Drain Pan — The drain pan sits under your evaporator coil to catch condensation. In older systems (15+ years), the pan can rust through or crack, allowing water to leak directly.
Frozen Evaporator Coil — When a frozen coil thaws, it produces more water than the drain system can handle, causing overflow and leaking.
Disconnected Drain Line — Vibration, improper installation, or accidental bumping can disconnect the drain line from the unit, causing water to leak at the connection point.
Dirty Air Filter — A severely clogged filter restricts airflow, causing the evaporator coil to freeze. When it thaws, excess water overwhelms the drain system.
What to Do Right Now
1. Turn off your AC to prevent further water damage
2. Soak up standing water with towels to prevent floor damage
3. Check your air filter and replace it if dirty
4. Look at the drain pan — if it's visibly cracked or rusted, that's your answer
5. Check the drain line exit outside your home — if no water is dripping out, the line is likely clogged
Preventing Future Leaks
The best prevention is regular HVAC maintenance. During our maintenance visits, we clean the condensate drain line, inspect the drain pan, and check for any drainage issues. This simple step prevents the vast majority of water leak problems.
You can also pour a cup of white vinegar down the condensate drain line every few months to help prevent algae buildup.
Dealing with an AC water leak in Carrollton, Villa Rica, or Bremen? Call All Seasons at (770) 809-1355 for fast, professional repair.