6 Signs That Your Air Conditioner Could Be Making You Sick
We rely on our air conditioners to keep us comfortable — especially when summer heat and humidity hit hard. But what if the cool breeze you’re enjoying is actually making you sick? From headaches and allergy flare-ups to mold growth and dry skin, a poorly maintained AC can impact more than just your comfort. It can affect your health and your family’s well-being without you even realizing the cause.
Indoor air quality plays a major role in how we feel day to day, and your AC system is one of the biggest contributors. The good news is that many of these issues are preventable with consistent air conditioner maintenance, clean filters, and prompt attention to moisture or airflow problems.
If you’ve noticed new or worsening symptoms while spending time indoors, keep reading — your air conditioner may be trying to tell you something. Let’s take a closer look at the warning signs and how you can fix them.
What We’ll Cover:
- Breathing or respiratory problems
- Evidence of mold
- Fatigue and headaches
- Contamination and germs
- Dry or flaky skin
- Ear, nose, or throat irritation
- How to remove black mold in your AC units
1) Breathing or Respiratory Problems
When your air conditioner becomes dirty, and the filters aren’t changed often, they become a breeding ground for all kinds of bacteria and fungi. This oversight can result in black mold in severe cases, as moisture can build up in the coils and ducts due to condensation that forms when cool air passes over them. When these microorganisms become airborne, they can cause various breathing problems. These issues might include a potentially fatal infectious pneumonia or even Legionnaires’ disease, which comes from the Legionella pneumophila bacteria.
Solution: Schedule regular air conditioner maintenance and change filters every few months, or more often if your household has pets, allergies, or heavy summer AC use. Clean filters support healthier airflow and help prevent dust, pollen, and other contaminants from recirculating through your home.
2) Evidence of Mold
Living or working near an old, moldy air conditioner can increase your risk of respiratory infection. Mold also causes symptoms like throat irritation, wheezing, and congestion. If you are experiencing any of these symptoms, it may be time to check your surroundings for mold. Check inside the vents of your air conditioning unit for small spots, and pull out the filter for inspection.
Solution: The best and most effective way to destroy mold is with a mixture of 1 qt of water and 1/2 cup of bleach. Be sure to scrub down the mold spots with a sponge and wear protective gloves. If the filter has moldy spots, replace it with a fresh one.
3) Fatigue and Headaches
Many individuals find that after a day of work, they tend to feel more tired than usual, some have headaches, and some have a general sense of weariness. Those same people will also find that once they leave the building, the symptoms often resolve. The chances are that it may be something in the building, such as the air conditioner. In a study published in the International Journal of Epidemiology on August 19, 2004, people working in office buildings with central air conditioning had more symptoms of illness than those who did not work in such buildings.
Solution: By simply raising the temperature, just so that you are not shivering, and by taking regular breaks to step outside for fresh air, you should be able to avoid the fatigue of “sick building syndrome.”
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4) Contamination and Germs
The Environmental Protection Agency has warned that we may be exposed to more pollutants inside than outside. One cause of this could be central air conditioning, which circulates old stagnant air rather than bringing in fresh air from outside. Meaning that if there is mold, dust, animal dander, viruses, or airborne infections floating about, then individuals are more likely to be exposed and get sick.
Solution: A central air conditioner can circulate dust, pet dander, mold spores, and other pollutants when its filters, coils, or ductwork are neglected. Keeping the system clean and allowing fresh air into the home when conditions permit can help reduce stagnant indoor air.
5) Dry or Flaky Skin
Spending lots of time in an air-conditioned environment can cause your skin to dry out. The cold, dry air often causes your skin to lose moisture, which results in dry, flaky skin. The same can be said for your hair and scalp, as they may suffer some ill effects as well.
Solution: An easy way to address this is to use a moisturizer or cream and drink plenty of water.
6) Ear, Nose, or Throat Irritation
Studies have shown that individuals who spend more time in an air-conditioned environment have increased use of health care services. An analysis found an increase in complaints related to ear, nose, and throat problems, respiratory issues, and dermatological problems.
Solution: Follow all the other steps above and take the time to ensure the facility and air conditioner are clean.
How to Remove Black Mold in Your AC Units
Are you trying to remove mold growing inside your air vents? There are a few DIY solutions to get you started. Mold can be killed with a mixture of 1 cup of bleach per gallon of water, but chances are you won’t be able to reach the mold deep inside the home’s ductwork. Instead, you can follow these steps to kill mold in air vents:
Step 1: Have the substance you suspect is black mold tested to confirm it is actually this type of fungus. You can avoid a potentially time-consuming and costly cleanup with this simple test.
Step 2: Identify the main cause of the mold in your home. Wet wall interiors and damp baseboards can contribute to mold. Identifying and treating the main cause of mold will ensure the problem doesn’t recur.
Step 3: Check the insulation surrounding the ductwork. If mold in your air vents has spread into the surrounding insulation, you will need to replace the insulation.
Step 4: Clean the interior of the air vents using a NADCA-recognized professional cleaner. Since improper removal of mold can be a waste of time and money, you will want to choose someone who has experience and specialized knowledge in removing fungus.
How Your Type of AC System Affects Indoor Air Quality
Whether your home uses a central air conditioner, a window air conditioner, or a ductless air conditioner, routine care matters. A central air conditioner may need regular filter changes and duct inspections, while a window air conditioner should have its filter, drain opening, and visible coils cleaned throughout the cooling season. A ductless air conditioner also requires clean indoor filters and periodic professional service to prevent dust and moisture from building up inside the unit.
No system is automatically immune to air-quality issues. Consistent air conditioner maintenance helps each type of system control humidity, circulate cleaner air, and support better indoor air quality for your household.
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Key Takeaways
- A poorly maintained air conditioner can contribute to respiratory symptoms, allergy flare-ups, headaches, fatigue, and skin irritation.
- Dirty filters, moisture buildup, and neglected ductwork can allow dust, mold, bacteria, and other pollutants to circulate indoors.
- Check AC filters regularly and replace them as needed to support cleaner airflow and efficient system performance.
- Look for visible mold around vents, filters, coils, and nearby insulation. Address the source of moisture to help prevent it from returning.
- Excessively cold or dry indoor air can contribute to dry skin, throat irritation, and general discomfort.
- If symptoms improve when you leave the house, consider whether indoor air quality or HVAC performance could be a factor.
- Avoid attempting complex mold removal or internal duct cleaning yourself. A qualified HVAC or NADCA-recognized professional can inspect the system safely.
- Routine HVAC maintenance helps protect indoor air quality, improve comfort, and catch problems before they become larger repairs.
THE HOME COMFORT EXPERTS
To prevent your air conditioning from making you sick, keep it running smoothly with regular maintenance and care. KCR’s HVAC maintenance appointments should work around your family’s schedule. For over 50 years, KCR has helped homes and businesses choose the right air conditioner. We’re proud to serve our customers efficiently and flexibly in managing efficient home heating and air conditioning.
To help prevent your air conditioner from making you sick, keep your system running smoothly with regular maintenance and care. KCR provides air conditioner maintenance for central air conditioner, window air conditioner, and ductless air conditioner systems. Our HVAC maintenance appointments work around your family’s schedule, helping you protect comfort, efficiency, and indoor air quality throughout the cooling season.
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