Does Your Air Conditioner Smell? Here’s What It Means

Air Conditioner that smells means there's something wrong with your unit. Find out what are the possible reasons for that below.

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HVAC maintenance

Air Conditioner that smells means there's something wrong with your unit. Find out what are the possible reasons for that below.

Ductless air conditioning unit emitting cool air, relevant to HVAC services and air quality discussions.

It's not uncommon for homeowners to notice unpleasant smells emanating from their air conditioning systems. These odors can be frustrating and concerning, but understanding the reasons behind them is the first step to resolving the issue. In this article, we will explore the common causes of air conditioner smells, prevention tips, and when to seek professional help to ensure a clean and healthy indoor environment.

Common Causes of Air Conditioner Smells

1. Mold and Mildew Growth

Mold and mildew can thrive in the damp and dark environment of an air conditioning system. When this happens, the growth can produce a musty smell that permeates throughout your home. Exposure to mold and mildew can lead to health problems, particularly for individuals with allergies, asthma, or weakened immune systems.


To prevent mold and mildew growth, ensure proper ventilation and airflow throughout your home. Regularly clean and inspect your air conditioner's components, paying close attention to the drain lines and evaporator coils. Using a dehumidifier can also help maintain a lower humidity level, making it more difficult for mold and mildew to grow.

2. Stagnant Water in the Drain Pan

Standing water in your air conditioner's drain pan can lead to unpleasant odors, as bacteria and mold begin to grow. This problem can arise from a clogged drain line or a malfunctioning condensate pump. To resolve this issue, check for any blockages in the drain line and clean it if necessary. If the problem persists, consider contacting a professional to inspect and repair the condensate pump.

3. Dirty Air Filters

Air filters are designed to capture dust, pollen, and other particles before they enter your home. Over time, these filters can become clogged with debris, leading to a reduced airflow and an unpleasant odor. It's essential to replace or clean your air filters regularly, depending on the type of filter you use. A good rule of thumb is to check your filters every 30-60 days, especially during peak usage months.

4. Clogged or Dirty Evaporator Coils

Evaporator coils are responsible for absorbing heat from the air and cooling it before it's distributed throughout your home. When these coils become dirty or clogged with debris, they can become less efficient and produce an unpleasant smell. Regular maintenance, including cleaning the coils and removing any debris, can help prevent this issue.

5. Burning Smell from Electrical Issues

If you notice a burning smell coming from your air conditioner, it's essential to address the problem immediately, as this could indicate an electrical issue. Potential causes include overheating components, damaged wiring, or a failing motor. In these cases, it's crucial to contact a professional HVAC technician to assess and repair the issue, as it can pose a significant safety risk.

How to Prevent Air Conditioner Smells

  • Regular maintenance and cleaning: Scheduling routine maintenance checks and keeping your air conditioner clean can prevent many common odor issues.
  • Proper ventilation and air circulation: Ensuring that your home has adequate ventilation can help prevent the growth of mold and mildew.
  • Humidity control: Using a dehumidifier or air conditioner to maintain a lower humidity level can make it more difficult for mold and mildew to thrive.
  • Use of air purifiers: Air purifiers can help to remove airborne particles and unpleasant odors, improving the overall air quality in your home.

When to Contact Best Owner Direct HVAC for Lingering AC Odors

It's essential to seek professional help in the following situations:

  • If the unpleasant odor persists or worsens despite your efforts to address the problem.
  • If you suspect electrical or mechanical issues, as these can pose significant safety risks.
  • If there's visible mold or mildew growth that requires remediation.

Addressing unpleasant smells from your air conditioner is crucial for maintaining a clean and healthy indoor environment. By understanding the common causes of these odors and implementing preventative measures, you can minimize their occurrence and ensure the comfort of your home. In some cases, it may be necessary to contact a professional HVAC technician at Best Owner Direct HVAC to diagnose and resolve more complex issues. Taking prompt action when you detect an unusual smell from your air conditioner can help prevent potential health risks and safeguard your home's air quality.

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Customer Testimonials

See what our happy customers have to say about their experience with Best Owner Direct HVAC & Electrical and why they continue to choose us for their home comfort needs.

    Been using them for years after the owner Kevin showed up so fast when our furnace went out one year. Been a fan since! Now, Danny is so great to work with, also. So friendly, knowledgable, fast. You guys are the best!

    Jessie M.

    Danny came out on a Saturday to diagnosis and fix my mom’s hvac unit.   He was able to quickly determine what the problem was and had all the parts to complete the repair right then.  His communication was clear and did a really good job helping us understand what caused the issue.  I would definitely recommend him and will be calling his company with any needs in the future. Thanks again!

    Michael R.

    Fantastic customer service! I had a furnace issue, called late morning and they fit me in for diagnostic right away. Technician was extremely knowledgable, walked me thru everything he found - unfortunately needed a new furnace (was 24 years old anyways), got it scheduled and installed within 24 hours as everything was in the warehouse (probably got lucky on what we needed). Overall excellent customer service, from scheduling to diagnostic, to installation. Highly recommend.

    Brad D.

    WOW! So impressed with so many aspects of this company. We had an animal die under the house in and could smell it coming out of the vents. When I called around, pest control was weeks out and Best Owner Direct was able to come the next day. Our technician, Danny was absolutely INCREDIBLE! Very professional, kind and made sure we had the problem taken care of the same day so we could breathe again! I look forward to continuing to work with them in the future for our HVAC needs.

    Todd & Tiffany F.

    Daniel was excellent, attentive to detail and committed to completing all tasks other installers overlooked. He worked tirelessly into the evening making sure everything was working properly with a water heather install, and he had a great attitude all along.

    Alma H.

    Excellent customer service, great communications answering all of our questions, left the site clean, and very respectful of our space within the house. Arranged to have someone come from the office later in the week to explain how the thermostat works.

    Vinod S.

    BOD is fast, efficient and affordable life save for my client who is purchasing a home with an old HVAC. Best Owner came quickly to help her asses the cost to replace it, and I will continue to recommend their services!

    Laurel A.

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