Thinking About AC Smell

Why Does My AC System Smell So Bad in Charleston, SC?

May 24, 2025

Instead of your home’s air conditioner improving your indoor air quality and maintaining a fresh-smelling residence in Charleston, SC, problems can occur that result in bad odors. There are several reasons this occurs. A professional AC equipment inspection can determine if maintenance or repairs are necessary to remove the smell and prevent future occurrences.

Ignoring Periodic Filter Changes

The filter in your AC system requires changing once every 30 to 90 days. If you’re not adhering to a frequent filter-changing schedule, this can result in a high concentration of particulate matter accumulating in your indoor air. This can cause bad odors when your air conditioning equipment turns on.

Failing to Schedule Routine AC Maintenance

When we perform routine maintenance on your air conditioning system, we will clean interior components. This process is important and helps promote fresh air in your home. We also inspect your system, ensuring particulate matter isn’t entering through holes, cracks or other forms of damage.

Biological Growth

Relative humidity in your home should be between 35% and 50%, and your residence should be free of plumbing leaks and moisture accumulation. If excess moisture is present, this can lead to biological growth, which can accumulate in your air conditioning system and cause bad smells. A routine inspection and ongoing monitoring of your relative humidity can help prevent problems.

Issues With Electrical Components

If electrical components in your air conditioning system are malfunctioning, this can result in overheating, smoke and bad smells. Electrical issues can lead to damage to your AC equipment, resulting in the need for a replacement. This is also a dangerous scenario that requires professional attention immediately to prevent fire and electrocution.

Problems With Pest Infestations

Pests can make their way into your HVAC system, building nests and leaving behind waste material. Running your air conditioning system will circulate foul pest odors throughout your home. It’s important to schedule an annual routine inspection for your air conditioning system and your ductwork.

With professional assistance, you can maintain healthy and fresh-smelling indoor air throughout the warm weather season. Our team can perform routine AC inspection and maintenance and take care of any necessary air conditioner repairs. Reach out to E.J. Thompson & Son LLC for more information about how to address that bad AC smell in your Charleston, SC, home.

Image provided by iStock

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