Air Conditioner Leaking Water Inside

Understanding the Problem

Water dripping from your air conditioner inside your home can cause damage to floors, walls, and ceilings if not addressed quickly. While AC systems do produce water (condensation) as part of normal operation, this water should drain outside—not inside your home. If you find water leaking from your indoor AC unit, the most common cause is a drainage problem. The good news is that many of these issues have relatively simple fixes.

Common Symptoms

You might be experiencing this problem if you notice:

• Water pooling around indoor unit
• Dripping from air handler or furnace cabinet
• Water stains on ceiling (if unit is in attic)
• Musty smell near AC unit
• Water damage to walls or flooring
• Full drip pan beneath unit

Possible Causes

This problem can be caused by several factors, listed from most to least likely:

DIY Troubleshooting Steps

Before calling a professional, try these safe troubleshooting steps:

1. 1

   Turn off the AC to prevent further water damage

2. 2

   Check and replace the air filter

3. 3

   Locate and inspect the drain line for clogs

4. 4

   Try clearing drain with wet/dry vacuum

5. 5

   Check if drain pan is cracked or overflowing

6. 6

   Look for ice on coils (indicates other issues)

Prevention Tips

Help prevent this issue in the future with these maintenance tips:

• Pour a cup of bleach down the drain line monthly during cooling season
• Change air filters regularly
• Schedule annual maintenance (includes drain cleaning)
• Install a float switch to shut off AC if pan overflows
• Keep drain line access clear for easy maintenance