Is it safe to run AC with black mold?

Author: Drew Batz III  |  Last update: Tuesday, April 29, 2025

Never Breathe In Unhealthy Air When you discover mold inside your AC unit, you should clean it right away. You definitely do not want to turn the unit on for any period of time. You will only spread the mold to other areas of the house. You especially need to be careful of black mold in an air conditioner.

How long until black mold kills you?

While black mold can cause health problems, there isn't definitive evidence to suggest it can directly cause fatality.

How to clean black mold out of an air conditioner?

remove the AC from the case. Mix 1/4 cup of bleach with a gallon of water and use a spray bottle to hose everything down. Wait 30 min and rinse with a garden hose (avoid spraying the front panel). repeat this until its clean then let it dry for a day. put it back together and reinstall.

What are the symptoms of air conditioner bacteria?

Legionella bacteria can proliferate in air conditioning systems, particularly in cooling towers. Inhalation of contaminated aerosols can lead to Legionnaires' disease, a severe form of pneumonia. Symptoms include high fever, cough, and muscle aches. In extreme cases, it can be fatal.

Does running the AC help with mold?

Wet shoes can bring moisture into the building, encouraging mould growth on flooring and carpets. Running air conditioning units regularly, even while the place is uninhabited. Ensuring there is no stagnant or humid air in your home or office means you won't return to an excess of mould.

Is Your AC Causing a Dangerous Mold Problem?

What are the 10 warning signs of mold toxicity?

Although symptoms can vary, the most common symptoms seen in people exposed to mold indoors include:
  • Nasal and sinus congestion.
  • Eye irritation, such as itchy, red, watery eyes.
  • Wheezing and difficulty breathing.
  • Cough.
  • Throat irritation.
  • Skin irritation, such as a rash.
  • Headache.

What temperature kills mold?

Most yeasts and molds are heat-sensitive and destroyed by heat treatments at temperatures of 140-160°F (60-71°C).

Can black mold in AC make you sick?

Like other forms of mold growth, black mold can trigger allergies, respiratory issues, and skin irritation. It's also linked to several respiratory symptoms and conditions, such as sinusitis and bronchitis.

What are the first signs of Legionnaires' disease?

Legionnaires' disease, the pneumonic form, has an incubation period of 2 to 10 days (but up to 16 days has been recorded in some outbreaks). Initially, symptoms are fever, loss of appetite, headache, malaise and lethargy. Some patients may also have muscle pain, diarrhoea and confusion.

How do I clean bacteria out of my air conditioner?

How to do a 'clean and disinfect' air conditioner treatment
  1. Turn off the power. We do not like to presume but this is common sense. ...
  2. Clean the filters. Now you need to locate your air conditioner filters. ...
  3. Clean The Coils. Most air conditioners have condenser coils and evaporator coils. ...
  4. Dry Everything And Put It Back.

What does black mold on AC look like?

If you see black spots or black dust appearing around air vents, there's a good chance that mold is growing inside. These black spots are usually difficult to wipe off, and if it has a wet, slimy texture, that's another indication of black mold.

What are symptoms of black mold exposure?

The most common symptoms of black mold exposure include:
  • Sneezing.
  • Coughing.
  • Nasal congestion.
  • Postnasal drip.
  • Red eyes.

How fast does mold spread in a house?

Most molds grow at a rate of about one square inch per day, but as more and more new areas are colonized, that growth may see an exponential boost. Again, humidity, temperature, airflow, and contaminant level can also help mold spread much faster throughout a property.

Is it safe to sleep in a house with black mold?

Because of the risks that come with mold exposure, it can be unsafe to sleep in a house with mold, particularly in the affected areas because you put yourself at risk of mold allergies. This becomes especially concerning if you are sensitive to the mold. When mold grows indoors, it can often be found in the bathroom.

Is it safe to clean black mold yourself?

Thus, exposure to the toxicity of black mold can cause harm to our physical health. Cleaning it yourself risks a greatly increased chance of acquiring damaging health conditions by unsettling the toxins into the air. Depending on the frequency of mold exposure, an individual's health can be severely compromised.

Can mold grow in your lungs?

When mold spores are inhaled, immune system cells surround and destroy them. But people who have a weakened immune system from illness or immunosuppressant medications have fewer infection-fighting cells. This allows aspergillus to take hold, invading the lungs and, in the most serious cases, other parts of the body.

What time of year is Legionnaires disease most likely?

More illness is usually found in the summer and early fall, but it can happen any time of year.

Can you get Legionnaires' disease from air conditioning?

Legionnaires' disease is a lung infection you can get from inhaling droplets of water from things like air conditioning or hot tubs. It's uncommon but it can be very serious.

How can I test myself for Legionnaires' disease?

Legionella Control Internationals innovative rapid legionella testing kit, LegionellaFast uses the latest “rapid-test” technology to detect Legionella bacteria in water. It is a quick and easy to use DIY tester that will deliver an accurate, straightforward YES::NO test result on-site in only 25 minutes.

Should you run AC if you have mold?

As already mentioned, mold thrives in damp, humid environments. Your air conditioner is designed to help dehumidify your home, removing excess moisture and preventing mold's growth. So keeping your air conditioner running in humid weather and situations is a proactive step to take. Mold also likes stale air.

Can mold behind walls make you sick?

It irritates the nose and throat, which can lead to both sneezing and coughing as your body tries to get rid of the irritant. Inhaling mold spores can also trigger coughing in people with allergies or an asthma attack, for those with asthma.

Can you go to urgent care for mold exposure?

Once the source of mold is uncovered and cleaned, you should seek medical treatment– whether or not you have begun to develop symptoms. If your symptoms are mild to moderate, visiting an urgent care center is a great option to receive same-day diagnosis and care.

What kills 100% of mold?

Hydrogen peroxide, commonly used to disinfect wounds, is active against a wide variety of micro-organisms including mold. It acts by releasing oxygen at a rapid rate, which kills mold by oxidizing the surface and breaking down proteins and DNA.

What does mold hate?

Mold hates light. Other than moisture there's nothing mold loves more than dark places. An easy prevention against mold growth is opening your blinds and shades. If it's warm enough out, open the windows.

What temperature should I keep my house to prevent mold?

Keeping the air conditioner set at 78 degrees or lower prevents mold buildup in the summer. Even when leaving for a few days or vacation, don't set it above 80. A higher setting won't provide enough dehumidification from the cooling process to prevent spores from growing.

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