Find out the most common causes of unpleasant smells, coming from your air conditioning system

A bad smell, coming from your air conditioning system, is very unpleasant, but you should not forget that there is a reason for every unusual sign. So, it is important to try and find out where exactly the problem lies. In this article, we'll look at the most common causes of an unusual air conditioner smell and what you can do to deal with it.

Why does my air conditioner smell so bad?

A bad-smelling air conditioner can be the result of both internal and external factors affecting the unit. Even if it's not always possible to get to the source of the smell right away, it's good to keep yourself informed and know what the different smells may be caused by.

7 reasons that cause bad smells coming from the air conditioner

  1. Dust, mold and mildew
    When there is high humidity in the air conditioner, mold and mildew can start forming in the unit. Moisture is a perfect environment for such microorganisms to form and spread quickly. Check the humidity in the room and in the air conditioner regularly. If you find leaks inside the system, fix them immediately. The cause of mold is often water retention in the drain line, so be sure to check this element as well.
    Also, an overly humid room can lead to moisture build-up in the air conditioner filters and the formation of mold and mildew. That's why it's sometimes a good idea to use a dehumidifier alongside your air conditioner.
  2. Dirty evaporator coils and blocked drain pipes
    Sometimes the smell coming from your air conditioning system can be really unbearable and can be compared to foot odor. In this case, you can clean the evaporator coils and unclog the drainpipes if they have been clogged.
  3. Smoking cigarettes
    The smell of nicotine is not only very unpleasant and suffocating, but it can also linger for quite a long time in the room where it was smoked. This is because when you smoke in a room that has air conditioning, the cigarette smoke passes through the air conditioning filter. So if you smell a lingering cigarette smell, clean the filter and don't let the room smoke again.
  4. Overheating parts
    This smell of burnt plastic or burnt parts usually appears suddenly during the operation of the air conditioner. If this is the case, what you need to do is to keep calm first. Switch off the unit and check that there is no wiring fault or the motor is not overheating. Wherever the cause of the problem lies, do not start the air conditioner until a professional technician arrives to fix the malfunction.
  5. Drainage problems
    There may be a sewer smell coming from your air conditioner. This is usually due to either a siphon problem, a burst pipe, or a clogged drain. To deal with the problem, you can seek the help of a plumber and an air conditioning technician.
  6. Decaying animal smell
    This is a rather unpleasant topic, but the truth is that it is not impossible that you may have a carrion smell coming from your air conditioner. As you've probably guessed, we're talking about an animal that's gotten into the air ducts or another part of the system. In such cases, you should seek the help of a pest control company and one for air conditioning maintenance.
  7. Freon leak
    Most often, a rotten egg smell is a sign of refrigerant leaking from the air conditioner. Since this is very dangerous for your home and family, do not try to deal with the problem yourself, but take the following measures immediately: turn off the unit and contact an air conditioning maintenance company.

Preventing air conditioner odour

Like everything in your home, if you don't clean and use your air conditioner properly, it's likely that dirt and dust will build up in it. 

The accumulation of mold, dirt and other particles is one of the most common sources of odours in air conditioners. It can occur at the coils, in the drain, ducts or at the filter. However, regular maintenance can help prevent odours from spreading throughout your home.

Take good care of your air conditioning system to protect your unit and your home from odours and the damage they indicate. This includes regularly cleaning the filters, drain line, and evaporator coils, and of course, scheduling regular professional maintenance before each active season. All of this will help you enjoy quality, efficient air conditioning. 

If you need a new air conditioner, take a look at the Fuji Electric air conditioners in our catalogs. All models are proven to be efficient, with a great range of advanced features. On our website, you will also find information about the distributors from whom you can purchase the model you want.