Why Your Air Conditioner Smells Bad in Perris, CA
Inland Empire Comfort
May 14, 2025
What’s that awful smell coming from your air conditioner? If your cooling system smells like something decaying, dirty socks, or rotten eggs, it’s a sign that something is majorly amiss with the unit.
Discover the most common causes of a smelly air conditioner below, then contact us for AC repair services in Perris, CA.
Why Does My Air Conditioner Smell Nasty? Top Causes of a Stinky Air Conditioner in Perris, California
Your air conditioner shouldn’t smell like much of anything when it runs. If you smell something foul and trace the odor back to your unit, it’s time to do some detective work to uncover the culprit. Here are some common causes of bad air conditioner odors and what to do about them.
Mold and Mildew Smells
Does your air conditioner smell musty or moldy, like an old library? This indicates that you have mildew and mold growing somewhere in your cooling system. In some cases, the odor can also smell like dirty feet.
The first thing to check is the air filter. If there’s mildew in your system, it will eventually make its way into the filter, causing a foul smell that infiltrates much of your home. Changing any dirty air filters may be enough to alleviate the stench.
A clogged condensate drain line can cause this odor as well. Check the drain line for blockages that prevent water from draining freely.
Electrical Odors
Why does my air conditioner smell bad? An electrical issue could be to blame.
If your air conditioner smells like it’s on fire, consider it an emergency even if you don’t see flames or smoke. The odor could be due to the unit overheating, in which case it will stop once the air conditioner cools down. In the worst-case scenario, there could be something wrong with the system’s or your home’s wiring.
Shut the unit off immediately and call us for emergency repairs right away. And if the unit is on fire, leave your home and call the fire department ASAP.
Rotten Egg Smells
If you’ve ever cracked open a rotten egg, you’ll never forget the stench. If you ever happen to suddenly smell this odor coming from your air conditioner, it’s a big clue that something is wrong with the system, namely, a gas leak.
Most air conditioners in Perris don’t run on gas, but some do. If yours is one of them, and you smell rotten eggs, shut the system off and call us for help right away. Do not stay in your house while you wait for repairs. Gas leaks are highly dangerous and can trigger a fire or explosion.
Garbage Odors
Does your outdoor unit smell like a bag of trash left out in the sun? Chances are that an animal has crawled inside your unit and died there. If left unnoticed for some time, the carcass will start to rot, producing that horrible odor you’re smelling now.
If you’re feeling brave, you can open the unit and extract the remains yourself. Don’t feel like tangling with a dead animal? Call our HVAC pros instead.
Why Does My Air Conditioner Smell Bad? Call Our HVAC Team in Perris, California
If you’re still wondering, “Why does my air conditioner smell so bad?” reach out to the pros at Inland Empire Comfort! We’ll resolve your stinky cooling system woes in no time. And if you’re considering AC replacement services, we can help with that, too. Call to schedule service in Perris, California, today.
Frequently Asked Questions
Learn more about air conditioner issues here.
How Do I Freshen Up an Air Conditioner?
To freshen up an air conditioner, change the filter and ensure the condenser lines are clean. Rinse the outdoor unit with a hose to remove debris.
Is a Bad Air Conditioner Smell Harmful?
Depending on the source of the stench, a bad air conditioner smell can be harmful. If your system smells like smoke or rotten eggs, call us for help right away.
How Do I Get Rid of Bacterial Buildup in My HVAC System?
Installing a UV sanitizer is a great way to eliminate bacteria in your HVAC system. Having your air ducts cleaned goes a long way, too.
Why Does My Air Conditioner Smell Like Nail Polish Remover?
If your air conditioner smells like nail polish remover, you might have a refrigerant leak. Refrigerant is typically odorless, but some types have a chemical smell. We’re pros at fixing these leaks, so call now.
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