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Why Is My Air Conditioner Leaking Water?

Why Is My Air Conditioner Leaking Water

As summer approaches, the scorching temperatures are starting to make it even more challenging to stay cool indoors. Unfortunately, some homeowners may experience a nightmare scenario – when their air conditioner starts leaking water inside the house! Understanding why is my air conditioner leaking water and what steps you can take to fix the issue can help bring increased comfort back into your home – fast.

Here is an in-depth look at what causes air conditioners to leak water and provide helpful tips on how you can prevent or stop this frustrating problem once and for all. Read on for valuable insight into why your air conditioner might leak water and how you can fix it quickly with minimal stress!

Reasons Window Air Conditioner Leaking Water Inside House

Here are a few reasons you are thinking about why is my window air conditioner leaking water.

1. Dirty Air Filter

A dirty air filter can significantly contribute to an air conditioner leaking water. The function of the air filter is to remove pollutants and particles from the air, preventing them from entering the air conditioner. However, when the air filter is dirty, it blocks the airflow, resulting in insufficient air circulating through the system, causing the evaporator coil to freeze and ice to form.

As the ice melts, it generates extra water with nowhere to drain, leading to water leaking from the air conditioner. The blocked airflow may also lead to an overworked and strained compressor, increasing the likelihood of leaks.

2. Clogged Condensate Drain Line

The Clogged Condensate Drain Line is crucial in adequately functioning an air conditioning unit. It is responsible for removing the water vapor produced by the cooling process. If the drain line becomes clogged or blocked, this can result in a buildup of water in the evaporator coil. As a result, the water will overflow and eventually leak from the air conditioner. 

A clogged drain line can occur for various reasons, including dirt, debris, and algae growth. This can cause the drain line to become clogged, leading to water overflowing and dripping from the air conditioning unit. Regular maintenance and cleaning of the Clogged Condensate Drain Line can help prevent this issue and keep the air conditioning unit functioning properly.

If left unaddressed, this problem can lead to water damage and potential mold growth, posing a health risk to building occupants. Therefore, it is vital to ensure the drain line is always clean and free from obstructions to prevent air conditioner leaks.

3. Condensate Pump Not Working

Without a functioning condensate pump, the moisture will continue to build up in the system, leading to an overflow of water. Moreover, a blocked or broken drain line can cause the pump to malfunction, causing the air conditioner to leak water

Additionally, it can lead to frozen coils that can result in water leaks. Therefore, keeping the condensate pump in good working condition is imperative to prevent water leaks and avoid causing damage to your home or property.

Regular maintenance and timely repair can help ensure the condensate pump works efficiently and keeps your air conditioner in peak condition.

4. Too Low Thermostat Set

When the thermostat set is too low, it causes the air conditioner to work harder than it needs to. This increased workload leads to increased moisture production, which can overwhelm the air conditioning system and cause water to leak.

As the air conditioner runs in overdrive, it cools the air more quickly than it can remove moisture. This excess moisture cannot be effectively drained away due to the overload on the system, leading to water accumulation in the drip pan and ultimately causing it to overflow.

In addition, the low thermostat set point may be causing the air conditioner to cycle on and off too quickly, further exacerbating excess moisture buildup and water leakage.

Therefore, it is crucial to ensure that the thermostat is set to an appropriate level to prevent unnecessary strain on the air conditioning system and avoid leakage issues.

5. Incorrect Installation

The condensate drain line can become clogged or misaligned when an air conditioner is improperly installed. As a result, condensation from the evaporator coils does not drain properly, resulting in moisture buildup and water spilling out of the unit. This can eventually lead to more severe issues such as mold or mildew growth, the deterioration of the air conditioner, and even pose a health risk.

The incorrect placement of the air conditioner can also affect its operational ability. For example, placing the unit in direct sunlight or an area with poor insulation can cause it to work harder, leading to greater water accumulation in the system. 

6. Old Pipes

As pipes age, they can become corroded, cracked, and weakened. This can lead to several issues, including reduced water flow and increased risk of leaks. For example, when an air conditioner’s drainage system is connected to old pipes, it can cause the drainage line to clog or leak, which can eventually cause the air conditioner to leak water.

Moreover, these old pipes can also develop clogs or get blocked by debris build-up, further restricting the water flow and leading to even more extensive damage and blockages. Therefore, keeping old lines well-maintained, cleaned, and inspected regularly is crucial to prevent leaks and other potential complications.

Is Water Dripping From AC Dangerous?

It is essential to recognize that air conditioning units work by removing humidity. As a result, the condensation that forms during the cooling process is drained away through a drain pan and pipe system. However, if this system becomes clogged or damaged, the condensation may start to leak out – this is what causes water to drip from AC systems.

Although water dripping from an AC may not be hazardous, it should not be ignored. If left unchecked, the water may accumulate and cause damage to your walls, floors, and fixtures. Moreover, moisture can create an ideal breeding ground for mold and mildew, harming your health in the long run.

Sometimes, water dripping from an AC may even point to a more severe underlying issue. For example, it could signal a refrigerant leak, which requires immediate attention from a professional technician. If left unaddressed, refrigerant leaks can pose serious health risks, such as dizziness, headaches, and breathing issues.

How to Fix Air Conditioner Leaking Water Inside

To fix these problems mentioned above, you first need to turn off your air conditioner. Then, locate and inspect the condensate drain line to see if it is clogged. If it is, you can try unclogging it using a wet/dry vacuum or a wire brush. Another option is using bleach and water to clean the drain line.

If the problem is a frozen evaporator coil, let the unit defrost entirely before turning it back on. This may take several hours or even overnight, depending on the severity of the ice buildup. Once it has defrosted completely, you can turn the unit on again and see if the problem has been resolved.

In some cases, the cause of the water leaking inside may be more complex and require the services of a professional HVAC technician. This is especially true if the problem persists despite your efforts to fix it. A qualified technician can diagnose and repair the problem, ensuring your air conditioner works properly and efficiently.


Fixing an air conditioner leaking water inside requires identifying the cause of the issue and taking appropriate action. With some basic troubleshooting skills and knowledge of how your AC system works, you can solve many common problems on your own. However, if the issue is more complex or persists despite your efforts, it is best to call a professional for assistance.