What to Do if You Find Mold on Your Furnace Filter in Your Colton, CA, Home

Inland Empire Comfort
January 29, 2025
Heating Repair in Colton CA

When thinking about mold problems, most homeowners in Colton, CA, instinctively imagine dingy bathrooms, basements, and kitchens. Therefore, they are often taken by surprise when they find mold on their furnace filter. What should you do in this situation?

The top choice for heating repair in Colton, CA, covers all the details you need to know in this post.


Where Does the Mold Come From in the First Place?

Mold spores are all around us. However, they don’t survive for long on surfaces or spread unless they have the perfect breeding ground.

Unfortunately, furnace systems with dirty filters running in high-humidity environments provide the airborne spores with everything they need to thrive. Once the mold has taken root, it often spreads quickly.


So, the mold on your furnace filter may only be a symptom of a more serious issue that might have spread through the rest of your HVAC system and into your ductwork.


The Right Steps to Follow When You Find Mold on Your Furnace Filter in Colton, CA

You need to move quickly when you find mold on your furnace filter. It’s the only way to prevent the further spread of the spores and to avoid dealing with mold problems every day. Here’s what you should do:


Shut Down the Furnace

If you keep running the furnace with the moldy filter, the spores will continue to spread to other parts of your home. Remember, mold spores are health hazards. Additionally, you’ll need the furnace shut down for the other steps you’ll have to follow to avoid accidents or damage to the system.


Remove the Moldy Filter

If you spot mold growth on your furnace filter, you have to remove the filter immediately. Be careful when handling the moldy filter to avoid inhaling or ingesting the spores.


Ideally, you should wear gloves and a mask for this task. Once you take out the filter, place it in a sealed plastic bag to prevent contamination and the spread of the spores.  At this point, you may want to replace the filter and move on, but that’s not the best idea.


Inspect the Furnace System for Mold Growth Elsewhere

Take a look behind the filter compartment, around the blower motor, and the condensate drain pan for signs of mold growth. If you notice extensive mold growth, you’ll need to call in a professional team to thoroughly inspect the furnace system.



They may also need to look at the ductwork to confirm that the mold growth hasn’t spread into it. The technicians will handle the rest of the process.


However, if you only notice trace elements of mold growth around the furnace, you can clean the affected areas with some warm water and detergent or a commercial mold cleaner and move on to the final step.


Replace the Filter

You should replace the filter with a similar, high-quality option that can trap all main air contaminants in your indoor space—including mold spores.


After you replace the filter, you should take steps to address the underlying causes of the problem (as we’ve touched upon above) to prevent it from recurring.


Is it Dangerous to Ignore Mold on Your Furnace Filter?

In a word, yes. The harmful nature of mold is well documented. However, mold in your furnace is an even bigger issue because the spores will continue to accumulate and spread across your home, increasing the risk of health problems for everyone in your Colton, CA, home.

Some of the health risks from ignoring mold on your furnace filter and not taking mold prevention seriously include the following:

  • Respiratory issues. Mold spores cause nasal congestion, wheezing, coughing, and throat irritation.
  • Severe allergic reactions. Mold is a common allergen, and people with mold allergies may experience severe reactions like rashes, watery eyes, and sneezing while a furnace with a moldy filter is running.
  • Worsening asthma. Mold in the indoor air could mean more frequent asthma attacks for sufferers.
  • Various longer-term issues. Consistently inhaling mold can lead to respiratory health problems where none existed before and the formation of immune system problems.
Changing your Furnace Filter

Call Inland Empire Comfort for Expert Help with Your Furnace System Problems in Colton, CA

Have you found mold on your furnace filter? Do you need help with changing your furnace filter? Call the HVAC system maintenance experts at Inland Empire Comfort today to schedule a consultation.


We’ll evaluate your furnace system and ductwork to confirm the extent of the mold problem. We’ll also let you know if you need comprehensive mold remediation. Call us today to get started!

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