How to Fix Air Conditioner Leaking Water Inside: Common Causes

Air conditioners are essential to make our homes cool in hot summers. But if you see water dripping from your air conditioner onto the floor, it can be annoying and worrying. This article will explain why caring for your AC is crucial, how ACs work inside, why water leaks from them, and How to fix Air Conditioner leaking water inside.
How to Fix Air Conditioner Leaking Water Inside
How to Fix Air Conditioner Leaking Water Inside

The Significance of a Properly Functioning Air Conditioner

It’s essential to take care of your air conditioner and ensure it works well. This keeps your home cool in the summer and provides a comfortable and healthy living place. Let’s dive deeper into why having an efficient AC is crucial.

Energy Efficiency:

An AC in good working condition consumes less energy, lowering electricity bills. Regular maintenance and efficient cooling systems can save you significant money in the long run.

Indoor Air Quality:

Air conditioners cool the warm air and filter out dust, allergens, and pollutants. A well-maintained AC improves indoor air quality, reducing allergies and respiratory problems.

Comfort and Productivity:

A comfortable indoor environment enhances your well-being and productivity. A malfunctioning AC can lead to discomfort and even heat-related illnesses in extreme heat.

Extended Lifespan:

Proper maintenance extends the lifespan of your air conditioner. Investing in regular servicing and addressing issues promptly can prevent costly replacements.

Understanding the Inner Workings of an AC

You need to know how these cooling systems work to troubleshoot and fix your AC leaks.

The Evaporator Coil

The evaporator coil plays a pivotal role in the cooling process. It absorbs heat from the indoor air, causing moisture to condense on its surface. This condensed water usually flows into a drain pan.

The Condenser Coil

On the flip side, the condenser coil releases the heat absorbed by the evaporator coil outside your home. This process is vital for maintaining a comfortable indoor AC temperature.

Refrigerant and the Cooling Process

Refrigerant, a chemical compound circulating within the AC system, facilitates the heat exchange. It shifts between gaseous and liquid states, cool air as it goes through the coils.

Understanding these components helps in pinpointing potential issues that may cause water leakage.

Common Causes of AC Water Leakage

Now, let’s explore the common causes of water leakage from your AC unit.

Clogged Drain Line

A frequently encountered problem is a clogged drain line that obstructs water flow out of the air conditioning unit. This blockage leads to an overflow and, consequently, leakage into your living space.

Dirty or Frozen Evaporator Coil

Another reason why your air conditioner leaks water is that a dirty or frozen evaporator coil can disrupt condensation. This can result from a lack of regular maintenance and lead to excess moisture buildup, eventually causing leakage.

Improper Installation

Faulty or improper installation can result in poor drainage and water leakage. Ensuring that your AC unit is correctly installed and positioned is crucial.

Refrigerant Leaks

Refrigerant is vital for cooling, and if there are leaks in the system, it can make the AC work less effectively. Also, these leaks can cause the AC to create extra water, leading to water coming out of it.

Drain Pan Issues

The drain pan is designed to collect condensed water and direct it away from your living space. Damaged or incorrectly positioned drain pans can fail to fulfill this function, leading to leaks.

How do you determine if your air conditioner is leaking water

To determine if your ac is leaking water inside your home, you can follow these steps:

Check for Visible Water:

Start by inspecting the area around your indoor hot air handler or furnace where the evaporator coil is located. Look for any signs of water pooling or dripping near the unit. Water will accumulate on the floor or in a nearby drain pan.

Listen for Unusual Sounds:

While your AC runs, pay attention to any unusual sounds, such as dripping or splashing noises. These sounds may indicate that the water is not draining correctly.

Examine the Air Filter:

Access the air filter, typically located near the air handler or furnace. When the air filter gets blocked or wet, it can stop air from flowing well and make more condensation, which might cause your air conditioner water to leak.

Inspect the Drain Line:

The drain line carries condensed water away from the AC unit. Check the drain line for any visible clogs or blockages. It could indicate a drainage water issue if you see standing water in the drain pan or notice drip water from the line.

Look for Ice Formation:

Inspect the evaporator coil for signs of ice buildup. If the ring is frozen, it can lead to excess moisture when it thaws, causing water leakage. Turn off the AC and allow the ice to melt before troubleshooting further.

Check the Drain Pan:

Locate the drain pan beneath the evaporator coil. Ensure it is not damaged and correctly positioned to collect condensed water. If the pan is damaged, it may not effectively contain the water, leading to leaks.

Monitor for Recurring Leaks:

Sometimes, water leakage may occur intermittently. Monitor the area around your AC unit over a few days to see if the issue reoccurs. This can help you identify persistent AC problems.

Schedule Professional Inspection:

If you can’t find where the leak is coming from or if it keeps happening, it’s a good idea to call a licensed HVAC system checking technician. They can check everything, figure out the problem, and fix it.

Preventive Maintenance:

To avoid future water leakage problems, consider scheduling regular preventive maintenance for your air conditioning system. Routine servicing by a professional can help identify and address potential issues before they lead to leaks.

By following these steps and staying vigilant, you can promptly detect and address water leakage from your air conditioner, ensuring your cooling system’s continued efficient and trouble-free operation.

How to Fix Air Conditioner Leaking Water Inside

If you’ve encountered water leakage from your AC unit, here are the steps to help you diagnose and resolve the issue effectively.

Turn Off the AC:

The first step is to turn off the air conditioner as a safety precaution. Put the thermostat in the “off” position by finding it. This will prevent further water leakage and electrical hazards.

Check the Air Filter:

A clogged or dirty air filter can reduce airflow over the evaporator coil to freezing and excess condensation. Access the air filter, which is typically located near the air handler or furnace, and inspect it. If it’s dirty, clean it or change your air filter with a new one, following the manufacturer’s recommendations.

Clear the Drain Line:

The drain line carries condensed water away from the AC unit. Over time, it can become clogged with dirt, algae, or debris. To clear the drain line, follow these steps:

  • Locate the drain line, usually a PVC pipe running from the indoor unit to the outside.
  • Disconnect the drain line from the unit or use a wet/dry vacuum to suction out the clog.
  • Mix warm water and vinegar in equal parts and pour them into the drain line to dissolve blockages.
  • Reconnect the line to the device once it is clear to do so.

Clean the Evaporator Coil:

  • A dirty or dusty evaporator coil can hinder the heat exchange, leading to excess moisture and water leakage. Here’s how to clean it:
  • Cut off the power to the air handler or furnace.
  • Access the evaporator coil, which is usually located in the indoor unit.
  • Gently brush away dust and debris using a soft brush or a can of compressed air.
  • Consider using a coil cleaning solution per the manufacturer’s instructions for thorough cleaning.
  • Before turning the power back on, let the coil dry completely.

Inspect for Refrigerant Leaks:

Refrigerant leaks can make the evaporator coil freeze, leading to water leakage. It’s essential to fix these leaks. Dealing with refrigerants needs special tools and training. So, it’s best to call a licensed HVAC service technician for a refrigerant leak. They can locate and repair it properly.

Ensure Proper Drain Pan Functionality:

The AC  drain pan beneath the evaporator coil collects condensed water and directs it away from your home. Ensure the drain pan is not damaged and correctly positioned to collect the water. If it’s damaged, consider repairing or replacing it to prevent water damage for future leakage.

Turn the AC Back On:

After doing the above steps and ensuring everything works correctly, you can turn your air conditioner on again. Set the thermostat to the desired temperature and watch the unit to check if it leaks water. If the problem keeps happening or you need clarification on the steps, call a professional HVAC technician for AC repair.
Following these steps, you can fix common causes of water leakage in your air conditioner and solve the problem. Regular maintenance and quick action will ensure your AC works well and keeps your home comfortable.

Steps to Keep Your Air Conditioner Healthy and Prevent Leaks

Regular Maintenance

Prevention is always better than a cure. Schedule regular maintenance for your air conditioner to catch and address potential issues before they escalate into major problems. This proactive approach can significantly extend the lifespan of your unit.

Professional Inspection

If the cause of the leakage remains elusive or if it persists after trying the above steps, it’s prudent to seek the expertise of a professional HVAC technician. They have the necessary tools and knowledge to diagnose and fix complex issues.

Preventing Future Leaks

Once you’ve successfully addressed the issue, consider taking preventive measures to avoid future leaks. Installing a condensate pan alarm or a water sensor can alert you promptly if a leak occurs again.


In conclusion, taking care of your air conditioner is not about comfort; it’s about making a healthy and energy-efficient place to live. Knowing how your AC works and what causes water leaks helps you solve problems. Following our steps, you can repair your air conditioner and keep your home cool and dry.


Q. Why is my AC leaking water inside my house?

A. Water leakage can occur due to various factors, including a clogged drain line, dirty evaporator coil, or refrigerant leaks. Identifying the specific cause is crucial for effective resolution.

Q. Can I fix an air conditioner leak by myself?

A. You can do simple tasks like cleaning the air filter or unclogging the drain line. But for more significant issues like refrigerant leaks, it’s best to get a professional’s help to ensure it’s done and works well.

Q. How often should I clean my air conditioner’s evaporator coil?

A. It’s a good idea to clean the evaporator coil yearly during AC maintenance. But if your AC isn’t cooling or leaking water, clean it sooner.

Q. Is air conditioner maintenance expensive?

A. Routine maintenance is relatively affordable compared to potential repair costs and energy savings. Regular AC maintenance can extend the lifespan of your unit and save you money in the long run.

Q. What are the signs of refrigerant leaks in an air conditioner?

A. If your air conditioner has a refrigerant leak, you might notice it’s also not cooling and hear hissing sounds.

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