7 Ways to Discover If There Is Mould in Your Air Ducts

If you’re concerned about mould on your property, you’re not alone. Many people wonder if they have mould in their air ducts or consider testing to see if they do.

The mould that grows in your vents is not uncommon, but it can cause problems, such as allergies, asthma, and other respiratory issues. As such, you need to address mould infestation right away.

Here are seven ways you can know if there is mould in your air ducts:

There Are Musty Odours in the House

First and foremost, if there is a musty odour coming from your air ducts, it is a major sign that there is the presence of mould. If you notice this musty odour, you must act upon it immediately.

Buy an air duct cleaner if you want to deal with the problem yourself, or call a professional to inspect your ducts for you.

There Is Mould on Your Air Ducts

Air duct cleaning is an important thing to do. It helps prevent dust and allergens from entering your home and keeps mould at bay.

If you have mould growing on the inside of your air ducts, it’s not a good sign. It means that the mould is developing in your system and will start to come out sooner or later.

You Have Water Staining on Your Walls

Another sign of mould infestation is water stains on your walls. Mould can cause excess moisture to form in your house, resulting in water damage to your walls.

It’s critical to get your air ducts cleaned the minute you see water on the walls.

You Have Allergy-Like Symptoms

If you are experiencing allergy-like symptoms, mould might be to blame. Allergy symptoms like coughing, sneezing, and sinus problems happen due to mould in your air ducts.

There is Dust in Your Air Conditioning Unit

Your air conditioner is the most important thing to check if you’re concerned about mould in your air ducts. If you notice that dust is building up on the inside of your air conditioning unit, that’s not a good sign.

This means that you aren’t properly cleaning your ducts, and the dust is collecting on the unit’s insides. Of course, the dust could also be from the mould that has been growing in the ducts.

There Is Clutter around the Air Ducts

Most of us don’t realize that air ducts are susceptible to mould. They get dusty and dirty over time, which is why we need to clean them.

However, if there is a lot of clutter around your air ducts, it means that they’re not getting the proper cleaning. The more mess present, the more likely you should have your vents cleaned.

There Is Water in the Attic

If you have an attic, a great way to know if there is mould in your air ducts is by looking for water in the attic.

Water in the attic clearly shows that the air conditioner is not doing a good job because it is not draining the water properly. This can make it appear that there is mould in your air ducts.

However, if there is water in the attic, you need to call a professional and check the AC unit before the situation gets worse.


Knowing how and when to clean your air ducts is an important thing to do in mould prevention. If you observe any or all of these signs in your home, you need to act quickly.

You must take time to check your air ducts for mould at least twice a year. Being proactive about cleaning your air ducts will save you a lot of time and money in the long run. Always remember that a clean home is a happy home.

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