If your air conditioner smells musty, there are a few things you can do to try to eliminate the odour. First, check the air filter and replace it if it is dirty. If the filter is clean, then clean the coils with a coil-cleaning solution. You may also need to have the ductwork professionally cleaned. If the musty smell persists, then it is likely that mould is growing somewhere in the system and you will need to contact  All Climate HVAC to inspect and clean your air conditioner.

Musty smell coming from your AC unit

If you notice a musty smell coming from your AC unit, it could be a sign that mould is growing inside the system. Mould can grow in any damp environment, and AC units provide the perfect conditions for mould to thrive. The musty smell is likely caused by spores being released into the air from mould growth.

Mould can cause a number of health problems, including respiratory infections, allergies, and asthma. If you have any concerns about your health after smelling musty air from your AC unit, it's best to consult with a doctor. In some cases, the mould growth may be minor and easily removed. You should consult our professionals to get a free quote. However, if the problem is more severe, you may need to have your AC unit replaced.

Causes of the musty smell

When your air conditioner smells musty, it's a sign that mould or mildew has begun to grow inside the unit. The most common cause of this is excessive moisture, which can be caused by a variety of factors.

Leaky ductwork is one possible culprit, as it can allow humid air to enter the unit and create the perfect conditions for mould growth. Another possibility is that the unit isn't draining properly, causing water to build up and eventually lead to mould.

Whatever the cause, musty smells coming from your air conditioner are a serious problem that needs to be addressed immediately. If left unchecked, the mould will continue to grow and could eventually cause structural damage to your home. Not to mention, it's simply not pleasant to have musty-smelling air circulating through your home!

Steps to take

When your air conditioner smells musty, there are a few steps you can take to get rid of the odour.

turn off the AC unit

When the weather outside is warm, the last thing you want is for your air conditioner to add to the discomfort by blowing musty-smelling air into your home. But sometimes, that’s exactly what happens.

There are a few possible explanations for why your AC unit might be circulating musty air, and fortunately, there are also a few things you can do to fix the problem.

One reason your air conditioner might be smelling musty is because of mould or mildew growth inside the unit. This can happen if the unit isn’t used often enough, or if it isn’t properly maintained. To clean mould or mildew from your AC unit, start by turning off the power to the unit at the breaker box.

Clean the coils with a brush

If your air conditioner smells musty, the first thing you should do is clean the coils with a brush. This will help remove any dirt or debris that may be causing the odour. You should also make sure to clean any other parts of the air conditioner, such as the filter and the drain pan. If you have a window air conditioner, you should also clean the outside unit. If the musty smell persists after cleaning, it may be time to call a professional for help.

Rinse with water and vinegar solution

When your air conditioner smells musty, it's time to give it a good cleaning. start by unplugging the unit and removing any removable parts, such as the filter. Next, rinse the unit with a water and vinegar solution. Be sure to rinse away all of the solutions and allow the unit to dry completely before putting it back together and plugging it in.

Dry coils with a towel

If your air conditioner's coils are dry, you can try wiping them down with a towel. This may help remove any build-up of dirt or dust that could be causing the musty smell. If the coils are very dirty, you may need to use a commercial cleaning solution specifically designed for air conditioners. Be sure to follow the directions on the cleaner carefully.

Put everything back together

If your air conditioner smells musty, there's a good chance that mould or mildew has begun to grow inside the unit. Left unchecked, mould and mildew can cause serious damage to your AC unit and may even lead to health problems for you and your family. Fortunately, getting rid of mould and mildew is relatively simple and only requires a few household items that you probably already have on hand.

Start by unplugging your AC unit from the power outlet. Next, remove the filter from the unit and discard it. If the filter was particularly dirty, it's a good idea to clean the area around the filter before putting in a new one. Once the old filter is out, use a soft brush or cloth to remove any visible mould or mildew from the inside of the unit.


When your air conditioner smells musty, it's important to take action to prevent the smell from returning. There are a few things you can do to help keep your air conditioner smelling fresh and clean.

First, be sure to clean or replace your air filter regularly. A dirty air filter can cause musty smells to build up in your air conditioner. Second, keep your air conditioner's coils clean. Dirty coils can also cause musty smells. Be sure to clean them with a coil cleaner or vinegar and water solution. Finally, make sure your air conditioner's drainage system is clear and working properly. A clogged drainage system can cause water to build up inside your air conditioner, leading to musty smells.

By taking these simple steps, you can help prevent musty smells from returning in your air conditioner.