Water leak from indoor AC unit onto floor

Jul 04 2025 - FERSA HVAC Heating & Air - HVAC & AC

Causes of Leaking AC Units and What to Do About Them

In this Article: hide

1 Why Is Your AC Leaking?

2 Common Causes of AC Leaks

3 When to Call for Emergency AC Repair

4 Preventing Future AC Leaks

5 FAQs – Causes of Leaking AC Units

6 Get Help with AC Leaks from FERSA HVAC

If you notice water pooling around your air conditioner, don’t ignore it. One of the most common HVAC issues in Texas homes is a leaking AC unit. Understanding the causes of leaking AC systems helps you catch the issue early and avoid costly water damage or system failure.

At FERSA HVAC Heating & Air, we’ve helped homeowners across Mesquite, Garland, and Dallas quickly identify and fix AC leaks with reliable repairs. Whether your system is dripping occasionally or constantly, here’s what may be behind the problem—and how to solve it.

Why Is Your AC Leaking?

Air conditioners naturally remove moisture from the air as they cool, and that water usually drains outside through a condensate line. But if something blocks or disrupts that process, water backs up or leaks inside.

Common signs include:

Drips or puddles under the indoor unit
Damp walls or ceiling stains
Mold or mildew around vents
Weak airflow and inconsistent cooling

If you’re in Rowlett or Richardson and seeing any of these signs, it’s best to troubleshoot the issue before further damage occurs. You can also review our guide on why your AC isn’t cooling for more related symptoms.

Common Causes of AC Leaks

Several issues can cause a leaking air conditioner, but the good news is they’re usually fixable when caught early. Here are the most frequent culprits:

Clogged drain line: Dust, mold, and algae can block the condensate line, causing water to back up into your home.
Dirty air filter: Restricted airflow can freeze the evaporator coil. When it melts, excess water may overflow the drain pan.
Rusty or cracked drain pan: Over time, the pan beneath the coil can corrode, especially in older units.
Low refrigerant levels: This may cause the coil to freeze and leak when it thaws, often tied to a refrigerant leak.
Improper installation: In newer systems, a poorly leveled unit or loose fittings may cause condensation to collect in the wrong places.

Homeowners in Farmers Branch, Lucas, and Allen often encounter these issues during spring and early summer, when the system first kicks into high gear.

When to Call for Emergency AC Repair

If you’ve cleaned the filter, checked the drain line, and the leak continues, it’s time to bring in the pros. Ignoring water leaks can lead to serious home damage, mold, and even system failure.

At FERSA HVAC, we provide emergency AC repair in Mesquite and surrounding cities like McKinney, Seagoville, and Princeton. We inspect the entire system, clear blockages, repair or replace damaged parts, and make sure your AC runs like new.

Preventing Future AC Leaks

The best way to avoid leaks is routine HVAC maintenance. Here’s what we recommend for homeowners across Plano, Forney, and Carrollton:

Replace your air filter every 30–60 days. Keep the area around your indoor unit clean and dry. Schedule seasonal HVAC inspections to catch problems before they escalate. Clean your condensate drain line at least once per year to prevent clogs.

These steps are part of the best HVAC maintenance checklist and help your system stay efficient, dry, and dependable all season long.

FAQs – Causes of Leaking AC Units

Is it dangerous if my AC is leaking water?

Yes. While it may seem minor, leaking water can damage ceilings, walls, and flooring, and could indicate deeper system problems.

Can a leaking AC stop cooling?

Yes. If the cause is a frozen coil or low refrigerant, it will impact your AC’s performance and cooling capacity.

What if the leak stops on its own?

Even if the water dries up, the underlying issue may still be present. It’s best to have it checked to avoid recurring problems.

Get Help with AC Leaks from FERSA HVAC

Whether it’s a clogged drain line or a frozen coil, a leaking AC shouldn’t be ignored. At FERSA HVAC Heating & Air, we offer fast, affordable repairs across Mesquite, Dallas, Garland, and beyond.