Skip to main content

Why Does My Air Conditioner Smell Musty?

 


Why does my AC unit smell musty? This is one of the most frequently asked questions during the summer months. Most people are referring to the removable, window-mount units. The answer is quite simple.  

Mold requires three things in order to grow: 1. Organic material. 2. Moisture (water) 3. Oxygen  Over time the AC unit will collect dust, dander, dirt and other material that may contain organic material inside the housing. So, you now have 1 of the 3 needed. There is Oxygen in the air. Now we have 2 of the 3. The AC unit is one big condenser which produces moisture. Now we have 3 of the 3 needed. So, it is just a matter of time before mold and bacteria are growing in you AC unit. Although the means of contamination is different, this is common with all AC systems, including residential and commercial HVAC systems.

Treatment

Window-Mount - We offer services to address mold in these units, however the prices of new units are so inexpensive, unless you had two units to treat, it may not be worth it. HVAC - Unit and duct cleaning by a certified professional is advised. If you cannot find one, we can recommend one for you. Just send us an email. Install an UV/Ozone purification system. Email us for more information. We are currently talking with AC repair shops around the Boston area to provide in-house service for them. Once complete, they will be listed on our website. 

 

Prevention

Window-Mount 

1. Make sure the drain hole is not clogged. 

2. Follow the manufacturers' recommendations for mounting the unit. If the unit is not at the proper angle, the water may not flow out as designed. This does not mean you should angle the unit. PLEASE, follow the manufacturers mounting procedures. 

3. Try to keep the unit clean by regularly cleaning or replacing the filters. 

4. Make sure the unit is completely dry before storing it. Also make sure the unit is covered during storage so dirt does not enter the unit. 

 HVAC Systems 

1. Replace the filters as recommended by the manufacturer. 

2. Frequent cleaning of the ducts. 

3. We offer the installation of UV and Ozone air purification units. These are low cost, low maintenance units. 

4. Proper insulation to prevent condensation. 5. Proper drainage. 

 

AC Unit Placement Issues

Basement Windows - The closer to the ground an AC unit is placed, the more it is likely to become a breeding ground for mold and bacteria. A low mounted unit is subjected to dirtier air and debris blown around by the wind. Also, insects are more likely to make it a home. 

Dark Side - AC units that do not get sunlight are prone to develop mold/growth issues. We have also encountered moss growing on them. 

Street Mount - If an AC unit is mounted near a busy street or traffic area, indoor air quality issues may occur. This is more common with diesel engines since the diesel exhaust is heavy and tends to linger. 

 

Legionnaires’ Disease

Not just mold can form in you AC unit, bacteria can as well. Bacteria can be just as or more harmful than mold. Regardless, you don't want one, either or both! Unfortunately, the biofilm coating found in most water containers harbor mold, bacteria and other microorganisms forming dangerous dynamic communities.

CDC States:

What is Legionnaires’ disease? 
 
 Legionnaires’ disease (LEE-juh-nares) is caused by a type of bacteria called Legionella. The bacteria got its name in 1976, when many people who went to a Philadelphia convention of the American Legion suffered from an outbreak of this disease, a type of pneumonia (lung infection). Although this type of bacteria was around before1976, more illness from Legionnaires’ disease is being detected now. This is because we are now looking for this disease whenever a patient has pneumonia. Each year, between 8,000 and 18,000 people are hospitalized with Legionnaires' disease in the U.S. However, many infections are not diagnosed or reported, so this number may be higher. More illness is usually found in the summer and early fall, but it can happen any time of year.  
 
What are the symptoms of Legionnaires’ disease? 
 
Legionnaires' disease can have symptoms like many other forms of pneumonia, so it can be hard to diagnose at first. Signs of the disease can include: a high fever, chills, and a cough. Some people may also suffer from muscle aches and headaches. Chest X-rays are needed to find the pneumonia caused by the bacteria, and other tests can be done on sputum (phlegm), as well as blood or urine to find evidence of the bacteria in the body. These symptoms usually begin 2 to 14 days after being exposed to the bacteria. A milder infection caused by the same type of Legionella bacteria is called Pontiac Fever. The symptoms of Pontiac Fever usually last for 2 to 5 days and may also include fever, headaches, and muscle aches; however, there is no pneumonia. Symptoms go away on their own without treatment and without causing further problems. Pontiac Fever and Legionnaires’ disease may also be called “Legionellosis” (LEE-juh-nuh-low-sis) separately or together. 
 
 How serious is it? What is the treatment? 
 
 Legionnaires' disease can be very serious and can cause death in up to 5% to 30% of cases. Most cases can be treated successfully with antibiotics [drugs that kill bacteria in the body], and healthy people usually recover from infection.
 

OSHA Quotes: 

It is estimated that in the United States there are between 10,000 and 50,000 cases of Legionnaires' disease each year. Legionnaires' disease is a bacterial disease commonly associated with water-based aerosols that have originated from warm water sources. It is often associated with poorly maintained cooling towers and potable water systems.

Popular posts from this blog

Multiple Sclerosis: Chronic Mycotoxicosis Mold?

  As time goes on and the study of mycology advances we are seeing more and more evidence of "mold" related afflictions. We see humans, animals and insects all suffer from the diabolical nature of "mold". Given my vocation, I often wonder on how my 20+ years of exposure to mold with affect my future health. You are what you eat. Treat your body well, give it clean vibrant foods as often as you can. Stop drinking alcohol and eating processed foods and foods with sugar. MS Definition (as defined by the national ms society) - Multiple sclerosis (MS) involves an immune-mediated process in which an abnormal response of the body’s immune system is directed against the central nervous system (CNS).  The CNS is made up of the brain, spinal cord and optic nerves. So, does the definition of MS coincide with the scientific research involving mycotoxins? "Future research should be directed at treating the disease as if it were caused by fungi and their devastating myco...

Biofilms - Health Ramifications

  This post is third in a series of biofilm posts in this blog. If you read either of the last two biofilm posts, you will have a better understanding of biofilms, below are the links if you would like to read them first. Biofilms Infecting our Drinking Water - https://bostonmoldblog.blogspot.com/2016/01/biofilms-infecting-our-drinking-water.html Biofilms and Dental Health - https://bostonmoldblog.blogspot.com/2016/01/biofilm-and-health-dental.html Biofilms form all around us and are attributed to illnesses and deaths every year. Here are a few stats from Montana State Anniversary.  13,000 - Deaths a year JUST from urinary catheters. 108,000 - Amputations due to diabetic ulcers caused by biofilms.  These stats do not account for the other associated impact biofilms have on our health. I cannot overstate the importance of good dental hygiene as it relates to overall health. This oral hygiene is also important in the health of our pets.  Consider this. Poor oral hygi...

Lung Infections Caused by Fungi in Soil

A recent study by researchers at  Washington University School of Medicine in St. Louis   found certain fungi in soil can cause a significant number of serious lung infections in 48 out of 50 states and the District of Columbia, including many areas long thought to be free of deadly environmental fungi. Histoplasma  is one of the three main  species  of soil fungi that cause lung infections in the U.S. Historically,  Histoplasma  was found in the Midwest and parts of the East,  Coccidioides  in the Southwest, and  Blastomyces  in the Midwest and the South. But a growing number of case reports and anecdotes suggest that all three have expanded out of their traditional ranges in recent decades. People develop fungal lung infections after breathing in spores from fungi in the soil. The spores become airborne when the ground is disturbed by farming, landscaping, construction, or even just by people walking around in fungi-rich environ...