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Window Air Conditioners

Can You Get Legionnaires Disease from a Window AC?

ByRalph P. Sita Updated onJanuary 15, 2025

Yes, it is possible to contract Legionnaires’ disease from a window air conditioner, although the risk is very low. Legionnaires’ disease is a type of pneumonia caused by Legionella bacteria, typically found in water. This bacteria is primarily spread through the inhalation of contaminated water droplets, which can originate from sources like shower heads, faucets, or air-conditioning units. In window air conditioners that use evaporative cooling, Legionella bacteria can proliferate in the water used to cool the air. When the unit expels these contaminated water droplets, they can be inhaled, potentially leading to infection. While the chances of contracting the disease from a window AC are minimal, it remains essential to regularly service and clean the unit to prevent bacterial contamination.

Can You Get Legionnaires Disease from a Window AC

Page Contents

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  • What is Legionnaires’ disease?
  • What is the Most Common Way of Contracting Legionnaires Disease?
  • How Do You Prevent Legionnaires Disease in Air Conditioners?
  • Can You Get Legionnaires’ Disease from Portable Air Conditioning
  • How Does Legionnaires’ Disease Spread?
  • Legionnaires’ Disease | Causes, Pathophysiology, Symptoms, Diagnosis, Treatment
    • Related Articles

What is Legionnaires’ disease?

Legionnaires’ disease is caused by a type of bacteria called Legionella.

These bacteria are found in water, and they can grow and multiply in warm, moist environments like hot tubs, cooling towers, and air-conditioning units.

When people breathe in water vapor or mist contaminated with the bacteria, they can get sick.

Symptoms of Legionnaires’ disease include fever, chills, coughing, and shortness of breath.

The illness can range from mild to severe, and it can even be fatal.

People with weakened immune systems, such as those with cancer or HIV/AIDS, are at greater risk for developing Legionnaires’ disease.

How to Prevent Legionnaires’ Disease in the Home

What is the Most Common Way of Contracting Legionnaires Disease?

The most common way of contracting Legionnaires disease is by inhaling water droplets containing Legionella bacteria.

These droplets can come from showers, faucets, or other water sources.

The bacteria can also grow in hot tubs, cooling towers, and decorative fountains.

People can also contract the disease by drinking contaminated water or coming into contact with contaminated soil.

How Do You Prevent Legionnaires Disease in Air Conditioners?

Legionnaires disease is a serious lung infection that can be fatal.

The infection is caused by the bacterium Legionella pneumophila, which is found in water. Legionnaires disease is most often spread through aerosmption of contaminated water, but it can also be spread through inhalation of contaminated droplets of water.

There are several things you can do to prevent legionellosis:

How Do You Prevent Legionnaires Disease in Air Conditioners

1) Keep your air conditioner clean and well maintained. Regularly clean and disinfect the cooling towers, evaporative condensers, and other parts of the system that come into contact with water. Use an approved biocide such as chlorine or quaternary ammonium compounds.

2) Adjust the pH of the water in your air conditioning system to between 6.5 and 7.5 using a commercial acid or alkaline solution; this will help to prevent the growth of legionella bacteria.

3) Install filters on all intake vents for your air conditioning system, and clean or replace them regularly according to the manufacturer’s instructions.

This will help to remove any bacteria that might be present in the air before it has a chance to enter the system.

Can You Get Legionnaires’ Disease from Portable Air Conditioning

Yes, you can get Legionnaires’ disease from portable air conditioning units.

The bacteria that cause the disease, Legionella pneumophila, can grow in the water of these units and be aerosmed when the unit is used.

The symptoms of Legionnaires’ disease include fever, chills, coughing, and difficulty breathing.

If you think you have contracted the disease, seek medical attention immediately.

How Does Legionnaires’ Disease Spread?

Legionnaires’ disease is a serious respiratory infection that can be deadly.

The cause of Legionnaires’ disease is the bacteria Legionella pneumophila, which is found in fresh water.

The bacteria can also be found in soil and in man-made environments, such as cooling towers, hot tubs, and air-conditioning units.

People can get Legionnaires’ disease by breathing in small droplets of water that contain the bacteria.

The droplets can come from shower heads, faucets, or other sources of water aerosed by people with the infection.

It is not possible to catch Legionnaires’ disease from another person.

Most people who develop Legionnaires’ disease will do so within 2 weeks after exposure to the bacteria.

Symptoms include fever, chills, coughing, and shortness of breath. Some people may also experience muscle aches, headaches, diarrhea, and vomiting.

If you develop these symptoms after being exposed to water containing Legionella pneumophila bacteria, it is important to see a doctor right away so that you can be treated with antibiotics.

Legionnaires’ Disease | Causes, Pathophysiology, Symptoms, Diagnosis, Treatment

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Ralph P. Sita
Author: Ralph P. Sita

Ralph P. Sita is a seasoned professional with deep roots in both the HVAC and tech industries. His family’s business, Ralph P. Sita, Inc., is a locally owned and operated HVAC contractor with over 42 years of experience, serving the DC, Maryland, and Virginia areas. The company specializes in residential, commercial, and industrial heating, ventilation, and air conditioning services, offering everything from installation and maintenance to custom ductwork and indoor air quality solutions -www.ralphpsita.com. A former CPA, he spent the last decade as co-founder and co-CEO at Cybrary, a leading platform for cybersecurity and IT training. Cybrary became the largest, most well-known cybersecurity training businesses in the industry under his leadership. Smart AC Solutions is an opportunity to give back to the HVAC community by providing reliable, actionable information on all things heating and cooling.

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Ralph P. Sita

Ralph P. Sita is a seasoned professional with deep roots in both the HVAC and tech industries. His family’s business, Ralph P. Sita, Inc., is a locally owned and operated HVAC contractor with over 42 years of experience, serving the DC, Maryland, and Virginia areas. The company specializes in residential, commercial, and industrial heating, ventilation, and air conditioning services, offering everything from installation and maintenance to custom ductwork and indoor air quality solutions -www.ralphpsita.com.

A former CPA, he spent the last decade as co-founder and co-CEO at Cybrary, a leading platform for cybersecurity and IT training. Cybrary became the largest, most well-known cybersecurity training businesses in the industry under his leadership.

Smart AC Solutions is an opportunity to give back to the HVAC community by providing reliable, actionable information on all things heating and cooling.

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