heating and AC, plumbing & electric
Thank you for considering Paschal Air, Plumbing & Electric as your service provider. We are proud to serve Arkansas & Missouri for more than 50+ years. You can rest easy because whatever your air, plumbing or electrical needs may be – there’s nothing we can’t handle. It’s our passion and it’s our promise to you, one that we proudly stand behind. Avoid the hassle – go with Paschal!


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heating and AC, plumbing & electric 479.900.0784
May 20, 2022

Top 4 Reasons Your Air Conditioner is Leaking Water

Summer is the time for your AC to shine. If your air conditioner is leaking water, you could find yourself in a big mess. Looking for symptoms of a leak at the start of things will save you time and money on repairs. Dark stains on your walls and ceilings, drips, weird smells and unusual humidity indicate an AC leak.

So, if your air conditioner is leaking water while it’s working overtime in this heat–it’s time to find the cause. Here are the top four culprits and how fix them:

Refrigerant is Low

AC units require some type of refrigerant, like Freon or Puron, to keep things cool. Typically a leak is the cause for low refrigerant.  If this is the problem, it will require an HVAC professional or things will go from bad to worse. If the refrigerant is low, it could freeze up the evaporator coil causing water to leak when it melts or it could mess up pressure inside your unit. That leak is apparent by a tell-tale hissing or bubbling sound. If you don’t catch the leak in time, it will ruin your HVAC system and will need to be replaced. 

  • Schedule a leak detection from a professional HVAC provider.
  • If the level is low or they identify a leak, a temporary seal can be applied until the evaporator coil is able to be replaced.
  • If the leak is too bad or if the system is too old, it may be best to consider replacement options.

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Check the Air Filter

A dirty air filter can also cause your AC to leak. A buildup of pet hair, dust and/or dirt could prevent airflow into your HVAC system’s evaporator coil. If air isn’t freely flowing, your evaporator coil will freeze. When that frozen condensation melts, it will cause water to leak out of your unit. That extra moisture could make your home prone to mold. Changing the filter is often overlooked by homeowners, but is a key step in maintaining the life of the HVAC system.


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Clogged Drain Line

A blockage in your condensate drain line might be the cause of your AC leak. Your air conditioner also acts as a dehumidifier of sorts, pulling moisture out of the air inside your house. The condensate drain allows that moisture to drain out. Gunk like dust, dirt or even mold can build up in the process, causing a pretty nasty clog. If the block is bad enough, water could back up into your house, causing water damage or flooding. Here’s how to fix it:

  • Locate your condensate drain line. It will be a PVC or copper pipe next to your outdoor HVAC unit. 
  • Use a wet/dry vacuum to suck out the gunk. Putting the vacuum on the end of the pipe and creating a seal around the circumference with a towel or tape should dislodge the clog and allow water to flow freely out of your system.
  • If you don’t have a wet/dry vacuum, you can also try the water hose method by running water up the pipe to dislodge the clog. 
  • If the vacuum method doesn’t work, it’s time to call in an HVAC professional to help fix the clog. The gunk might be too tough and commercial equipment might be required to do the job. 

Rusty Drain Pan

If it’s more than a dozen or so years old,  you might need to replace the drain pan. Since some drain pans are made of metal, they are prone to rusting and corrosion. 

  • Sometimes you are able to repair small cracks in your drain pan with a sealant.
  • If there are large cracks or holes it’s best to replace the drain pan. You can buy replacements at most home improvement stores.

BONUS TIP: Float Switch

Installing a float switch is an insurance policy of sorts. It cost less than a few hundred bucks for a professional to install, but it could save you thousands in home repairs  in the long run. A float switch is a mechanism that will shut off your system if your drain pan has excess water. So, if you have a leak caused by something like a clogged drain line or heavy condensation, the float switch will detect the extra water and shut down your HVAC system before any major damage is done. 

Call a Professional

If you can’t find the leak or if it reoccurs, it’s time to call in a professional HVAC company to fix your AC unit. The longer you wait, the more prone you are to water damage or damage to the AC itself. At Paschal Air Plumbing & Electric, a Paschal Pro can help you diagnose your problem and get your AC back to working condition in no time. Give us a call at 479-202-8961 to schedule an appointment or book online.

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