Why Is My AC Leaking Water Indoors? A Homeowner’s Guide for Edmond, OK
Few things are as frightening as finding a puddle of water by your air conditioning unit; if you've wondered,
"Why is my AC leaking water inside my home?" you're in good company.
In this article we'll review some typical reasons for indoor AC water leaks, the local climate and weather conditions that contribute to these problems, and how you can repair or prevent them.
Why It’s Happening: Seasonal and System Stressors
While high temperature is a concern during an Edmond summer, it is humidity that will likely be the bigger burden on your air conditioning system. Humid air holds much more moisture than dry air; therefore, the amount of moisture your AC has to remove from the air you breathe is greater when the air is humid. Therefore, there is going to be more condensate being formed with the increased humidity, and if something disrupts this process, the water could leak into your home as opposed to draining properly.
In Edmond, for example, the average humidity level in July is approximately 60% or higher.
Attic air conditioning systems, especially those found in older homes, are also more susceptible to leakage problems.
As such, the potential for water damage and mold growth will rapidly escalate in warm, humid environments.
What Causes Indoor AC Leaks (And How to Stop Them)
Clogged Condensate Drain Line
Algae, mold, or debris can block the drain line.
Water backs up and overflows from the drip pan.
A gurgling sound or full pan is a common warning.
Fix: flush with vinegar or call a pro for clearing.
Dirty Air Filter Leading to Frozen Coils
A dirty filter restricts airflow.
Coils freeze up, then thaw into a mess.
Prevent by changing filters monthly.
Low Refrigerant Levels
Causes pressure drop and coil freezing.
Ice melts into pooled water.
Only HVAC pros can recharge refrigerant safely.
Cracked or Rusted Drip Pan
Metal pans corrode over time.
Plastic pans can crack.
Check for rust spots or standing water.
Incorrect Installation or Loose Lines
Unlevel units may not drain properly.
Disconnected lines leak immediately.
FAQ: How do I know if it's serious?
If your unit shuts off on its own or you see water stains, it’s time to act.
What You Can Do Right Now
Here’s what Edmond homeowners can do to reduce the risk:
Check and replace your filter monthly.
Flush your drain line with a cup of vinegar every 60–90 days.
Inspect the drip pan for standing water or rust.
Make sure the unit is level (especially attic installations).
Book annual HVAC maintenance—spring is ideal in Oklahoma.
Pro Tip: If your AC is in the attic, consider adding a float switch that shuts it off before water overflows.
Why It Matters More in Edmond
Between hot summers and variable humidity, Edmond systems face stress other climates don’t. Attic-mounted units are common here and vulnerable to drain line clogs or pan rust. Fast leak response matters because drywall, ceiling beams, and flooring can absorb gallons of water before you even notice.
If your AC is leaking or showing signs of stress, schedule a local service call with our Edmond HVAC pros.
Key Takeaways
Leaks usually come from clogged drains, dirty filters, or refrigerant issues.
Mold and structural damage can happen fast in Edmond’s climate.
Simple maintenance steps can prevent thousands in water damage.
Annual checkups keep your system draining safely and efficiently.
Call local professionals at the first sign of trouble.
Written by A&T Mechanical | Updated November 2025