signs of mold in your air ducts

How can you tell that there is mold in your HVAC system? Thankfully, some of the signs are relatively easy to spot.


Visible Mold

The most straightforward sign is, of course, actual mold. If you see fuzzy white fibers (that remind you of cotton balls) or a stain that looks suspicious – it looks like you are dealing with mold.


Moisture is the thing that causes mold growth in the first place, but did you know that if your AC has this substance inside, it is going to create added moisture inside the house? 


how to spot mold

When mold is present in a large enough volume, it will begin to emit a distinctive smell. Many people describe the smell of mold as musty or earthy. The smell of mold may be unpleasant, but on the bright side it makes larger mold infestations easier to detect.

When you have mold buildup in your ducts,


the smell will usually be strongest while your HVAC system is running. This is because the air that comes from your ducts will pick up and carry more mold spores as the mold inside the ducts spreads. When your system isn’t running, spores will settle inside the ducts and the smell will be harder to notice.


Illness and Allergy Symptoms

By far the most significant risk of having mold in your ducts is the health effects it can cause for your family. While breathing mold spores can cause symptoms in virtually anyone, some people have an allergy to mold spores that makes them especially sensitive to moldy ducts. Likewise, mold can exacerbate the symptoms of anyone in your family with pre-existing respiratory problems.



Allergy symptoms

such as itchy, watery eyes; coughing and sneezing; and difficulty breathing can be signs of mold if they occur indoors, especially if they are more severe in rooms that are air-conditioned. In more serious cases, breathing mold spores can cause fatigue, nausea, vomiting and diarrhea, and confusion. Stop using your HVAC system until you’ve had it inspected for mold if you see these symptoms in your home.