air conditioners are mechanical devices that can break down any time. When this happens, it can leave you feeling hot and bothered—and not in a good way.

Fortunately, most problems with window ACs are pretty easy to fix. In most cases, they're caused by small issues like misaligned airflow vents or a clogged filter that's easily remedied with some DIY know-how and a few tools.

Even if things aren't quite so straightforward, they're almost always repairable somehow!

Reasons Why Window AC Is Leaking Water

window ar (1).jpgReasons Why Window AC Is Leaking Water

Here are six common reasons why your window air conditioner is leaking water.

It's Leaking From the Drain Hose

Some air conditioners come with a drain hose designed to take excess water away from the machine to avoid flooding the room. If your AC has such a hose leaking, it's probably not connected correctly.

Check it and ensure it's fitted to the drain point on the machine. If it's blocked or damaged somehow, it may not be able to do its job properly. You can also ensure it's not frozen by running a little water through it first.

If you've checked the hose and are sure it's not blocked, you may need to reattach it to the AC. This can be very tricky, so unless you're confident you can do it, it's best to call a professional.

There's Too Much Condensation

There's a good chance that your air conditioner is leaking water because it's producing too much condensation. ACs are designed to take the heat out of space and transfer it to the outside air. Doing so cools down the air inside your home—when condensation occurs.

You might see water collecting in the drip tray at the back of the machine. It might also appear on the floor around the AC itself.

To fix the problem, adjust your AC's thermostat, so it doesn't remove as much heat from the air inside your home. You can also try to increase your AC's airflow.

The Drip Tray Is Full

If the drip tray at the back of your AC is full of water and the AC is still working fine, it's probably because there's too much condensation inside the machine. Adjust the thermostat to let less heat out of the system and more into the home.

If you can't purge the system fully, you can also try cleaning the drip tray. Make sure you clean it out regularly to avoid clogging the AC's air vents. If you don't and the tray is full of water, it can cause the condensation to back up into the machine and flood the flooring around it.

Your Condenser Isn't Properly Vented

Your AC condenser is the part of the machine that transfers the heat from inside your home to the outside air. If it's not properly vented, the air surrounding it won't be able to escape.

This could cause the AC to overheat and shut down. It could also cause the condenser to leak water.

The condenser must be vented outside if your AC is enclosed, like in an attic or crawl space. Look at it from outside your home to check that it's properly vented. You should see plenty of airflow around it.

If you don't, it's probably because the vent hose is blocked or too short. You can solve the problem by extending the vent hose (or buying a new, longer one).

window ar (2).jpgYour Condenser Isn't Properly Vented

The Evaporator Has Cracked Or Shattered

The evaporator is the part of your AC that sits inside the room being cooled. If it's cracked or shattered, water can leak out. If you think your evaporator might be damaged, check for signs of discoloration or a strange smell.

It's unlikely that you'll be able to see the damage, but you might be able to smell it. It'll smell like something rotten. If you think your evaporator is damaged, you'll need to replace it. This is a job best left to a professional.

The cooling coil is clogged and leaking water.

The cooling coil is the part of your AC that transfers the heat from the inside of your home to the outside air. If it's clogged with debris, water can leak out of it.

If you see a puddle of water beneath your AC, check the cooling coil for signs of clogging. If the coil is clogged, you'll need to clean it. This is best left to a professional.


If my AC leaks water, can I still run it?

Please turn off your air conditioner as soon as you notice it leaks. The water will stop flowing even if you don't feel any difference in the air in your home. Air conditioners become more susceptible to further damage as water leaks.

How do window air conditioners drain?

Under the exterior part of most window air conditioners, you will find a drainage hole. To access it, you will need to go outside. The AC must be removed from the window if it cannot be accessed outside.

My window air conditioner has a drain plug. Should I remove it?

It is advisable not to remove the drain plug from a window air conditioner. Typically, a technician takes out the plug to drain the water of preparing the unit for storage. Water can also be channeled away from the unit by using it.

Is it possible for a leaking air conditioner to cause a fire?

It can be particularly problematic if the AC unit is near exposed electrical equipment. Water coagulation can cause an electrical short, which can cause an electrical fire. An immediate and dangerous health risk is associated with water dripping on open electrical circuits.

Is there a specific time limit I should drain my window air conditioner?

Portable ACs must be drained every two to eight hours in high-humidity areas. Other areas require that you drain the unit once a day or every couple of days.


Air conditioners are a must during the warmer months, but they're not without their flaws. While many problems can be easily fixed at home, others should be left to a professional. When experiencing issues with your air conditioner, it's important to pinpoint the problem as soon as possible.

Some issues are more serious than others, so it's important to deal with them immediately. For example, if the air conditioner is leaking water, it could be a sign of a serious issue. In some cases, it could even lead to flooding.

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