How to Address and Fix Water Leaks in Your Air Conditioner

May 21, 2024

Experiencing water leaks from your air conditioner can be a worrying issue for many homeowners. Fortunately, understanding the causes and solutions can help you manage this common problem. Here, we'll explore various reasons why your air conditioner leaking water might occur and how to fix it.

Are you experiencing any of the following:

Example 1: Sarah noticed her window air conditioner leaking water inside her apartment. Upon inspection, she found that the unit was not level. After adjusting the installation, the leaking stopped, and her unit worked efficiently again.

Example 2: John had a central air conditioner leaking water from the attic unit. He discovered that the condensate drain line was clogged. Using a wet/dry vacuum, he cleared the blockage, and the leaking issue was resolved.

Example 3: Emily's portable air conditioner leaking water inside her home was due to a dirty air filter. After replacing the filter, the unit no longer leaked, and the airflow improved significantly.

Example 4: Mike observed his air conditioner leaking water outside. It turned out that the refrigerant levels were low, causing the evaporator coils to freeze and thaw. A professional technician refilled the refrigerant, and the leaking stopped.

Common Causes of Air Conditioner Water Leaks

One of the most common reasons for an air conditioner leaking water is a clogged condensate drain line. This line can become blocked with dirt, debris, and algae, causing water to back up and leak from the unit. Homeowners often notice water leaking from air conditioner vents when this occurs.

Dirty Air Filter

A dirty air filter can lead to restricted airflow, causing the evaporator coils to freeze. When these coils thaw, the excess water might overflow the drain pan, leading to a noticeable air conditioner water leak inside the house.

Damaged or Rusty Drain Pan

Over time, the drain pan can become damaged or rusty, making it unable to hold water properly. This often results in air conditioner leaking water inside.

Improper Installation

If your air conditioner unit is not installed level, it can cause the condensate to flow improperly and lead to leaks. This problem is common with window air conditioners leaking water from the bottom.

Low Refrigerant Levels

Low refrigerant levels can cause the evaporator coils to freeze and then thaw, resulting in water leaks. Homeowners with a central air conditioner leaking water should check their refrigerant levels.

Steps to Fix Water Leaks

1. Clear the Clogged Drain Line

  • Locate the condensate drain line and check for any visible blockages.
  • Use a wet/dry vacuum to remove debris from the line.
  • Flush the drain line with a mixture of water and vinegar to clear any remaining clogs.

2. Replace or Clean the Air Filter

  • Regularly check and replace the air filter every 1-3 months.
  • A clean air filter ensures proper airflow and helps prevent the coils from freezing.

3. Inspect and Replace the Drain Pan

  • Check the drain pan for any signs of damage or rust.
  • Replace the drain pan if necessary to ensure it can properly collect and drain water.

4. Ensure Proper Installation

  • Verify that the air conditioner is level.
  • Adjust the position of the unit if it is not level to ensure proper drainage.

5. Check Refrigerant Levels

  • If you suspect low refrigerant levels, contact a professional HVAC technician.
  • A technician can check the refrigerant levels and refill if necessary, preventing the coils from freezing.


Addressing an air conditioner leaking water can often be straightforward if you understand the common causes and solutions. By performing regular maintenance and promptly addressing any issues, you can prevent water leaks and keep your air conditioner running smoothly. If you're ever in doubt, don't hesitate to contact a professional HVAC technician for assistance.

Don't let a leaking air conditioner disrupt your comfort and peace of mind. Follow our guide to diagnose and fix the issue, or contact a professional HVAC technician for expert assistance today!

Written by: Abbott Air Marketing

Disclaimer: The information provided on this website' and blog is for general informational purposes only. All information on the blog is provided in good faith, however, we make no representation or warranty of any kind, express or implied, regarding the accuracy, adequacy, validity, reliability, availability, or completeness of any information on the site. We encourage our readers to conduct their own research and due diligence. The website and its authors are not liable for any errors or omissions in this information nor for the availability of this information. Any action you take upon the information you find on this blog is strictly at your own risk. The content may change over time, and some information may become outdated after the time of publication. We are not responsible for the views, opinions, or accuracy of facts referenced in our articles, as they are meant for informational purposes only.

Share with family and friends & Link Up With Us

By sharing we can help family and friends that might need future Air Conditioning Services. We are currently working within Venice, Englewood, North Port and surrounding areas with plans to expand further. Please feel free to share from our social media platforms mentions below.

Come join us on Facebook where we share weekly events and happenings. Stay up-to-date with us on Facebook!

Facebbok blue logo

Our brag rights are all posted to Instagram and we hope you will enjoy the photos and reels shared on here!

Instagram Logo