Smelly Aircons—What Causes Them And How To Fix It?

Air Conditioning technician

You may not be thinking about it when it is working well, but the moment something goes wrong, you’ll notice it. We’re talking about your air conditioner, more specifically how it smells. Yes, talking about smell may seem out of the ordinary at first, but smell is actually one of the most obvious ways to spot problems in the AC.

Do you smell something funny from your AC? If so, here are the common causes for it, the dangers of such issues, and how to address the problem:

What Are The Common Causes Of Smells In The AC System?

There are several reasons behind smelly ACs; one of them is moisture contamination. If you leave the unit running in a cold environment (like the walk-in closet in your master suite), then the condensation is going to cause the obvious—mould and mildew.

In addition, there are several other causes of smells in an AC system. When you have a cracked filter, it can cause the AC to smell like a skunk. The same thing goes for the coils—if they are covered with dust and other contaminants, it will make the AC system back up, and then it will start to smell.

What Are The Dangers Of Smelly Air Conditioner?

As you probably know, mould and mildew can cause serious respiratory issues, as well as eye and skin irritation. The longer the AC system is left in poor conditions, the more problems it will cause.

The same thing goes for a dirty AC. If you leave the unit dirty, the bad smell will be there to stay, and it won’t get better by itself. There are several problems that are caused by the dirtiness of the AC. The most obvious one of all is that the dirt will coat the AC coil, reducing its efficiency. And if you don’t clean the coil, the dirt will start to build up, and your AC won’t be able to cool the air as effectively as before.

How To Get Rid Of AC Smell?

There are some specific solutions to the AC smell problems. First of all, when it comes to mould, you will need to address the moisture.

The easiest thing you can do is to install a detection and protection device in your AC system. In the best-case scenario, it will warn you when your AC system is at risk. The second step is to change your filters. Put in a fresh air filter and get rid of the old one.

And, of course, you will need to clean the coils from the dirt. However, you should always be careful when cleaning your AC. Make sure that you are wearing some protective gear and that you are not in a contaminated environment.


If you notice that your AC smells like something is wrong, you should take action immediately. You won’t want to wait to clean it, as the matter will get worse. And you won’t want to leave a dirty AC running, as you will constantly be breathing in contaminated air. So, make sure to get the AC cleaned as soon as possible. If possible, hire professionals to clean it for you. That way, your AC can get the most cleaning possible to ensure you enjoy cool, clean air at all times.

Roberts Air Conditioning specialises in air conditioning sales, repairs, and more in Australia. If you are looking for aircon service in Sydney, call us today!