Can You Be Allergic to Air Conditioning

Can You Be Allergic to Air Conditioning?

Can You Be Allergic to Air Conditioning? An In-Depth Look

The short answer is yes, it is possible to be allergic to air conditioning. While not common, some people can develop allergies or asthma-like symptoms when exposed to the cool air from ACs. Here’s an in-depth look at why this happens and what can be done about it.

What Causes AC Allergies?

Air conditioners work by pulling in air from outside, cooling it down, removing moisture, and circulating the air. This cooled and dehumidified air can irritate the respiratory system for some people. There are a few specific triggers:

  • Dust and Pollen – AC units can accumulate dust, pollen, and other allergens as they pull in outside air. This gets circulated indoors and can cause reactions.
  • Mold and Mildew – The condenser coils and drainage areas of AC units are prone to mold growth. Inhaling mold spores can trigger allergies and asthma symptoms.
  • Cold, Dry Air – The dehumidifying effect of air conditioning can dry out the air. Breathing in very dry, cool air can irritate the throat and lungs.

Symptoms of Air Conditioning Allergies

Reactions can vary from mild to severe depending on the individual. Common symptoms include:

  • Sneezing, coughing, congestion
  • Runny or stuffy nose
  • Postnasal drip
  • Itchy, watery eyes
  • Wheezing, chest tightness
  • Difficulty breathing
  • Skin irritation or rashes

These symptoms are usually temporary and go away after leaving the area with air conditioning. But frequent or prolonged exposure can lead to chronic allergic reactions in sensitive individuals.

Who is Most At Risk?

Those with a history of atopy or allergies have a greater chance of reacting to air conditioning. This includes people with:

  • Allergic rhinitis or hay fever
  • Eczema
  • Asthma

Younger children and the elderly may also be more susceptible. That said, even people without known allergies can occasionally experience AC-triggered symptoms.

Preventing and Managing Air Conditioning Allergies

While AC allergies may not be fully preventable, there are some steps you can take to reduce symptoms:

  • Use high-quality filters to remove allergens from the air
  • Have professional cleanings yearly to prevent mold growth
  • Run a dehumidifier to keep indoor humidity around 30-50%
  • Use a portable air purifier when the AC is running
  • Avoid directing AC vents right at your face
  • Take over-the-counter antihistamines as needed for symptoms
  • Use nasal saline sprays to treat dry nasal passages

For chronic, severe reactions you may need to consult an allergist. Immunotherapy or allergy shots can help desensitize you to the specific triggers over time.

When to See a Doctor

See your doctor if you experience:

  • Severe shortness of breath, chest pain, dizziness
  • Symptoms that persist even after leaving the AC area
  • Symptoms that interfere with sleep or daily life

Rarely, some people can experience anaphylaxis – a life-threatening reaction – from air conditioning allergens. Seek emergency care if you develop signs of anaphylaxis like difficulty breathing, swelling of the lips/tongue, fainting.

Home Air Conditioning Alternatives

If your AC allergy is severe, you may need to consider alternative cooling methods at home. Some options include:

  • Portable evaporative coolers – add moisture instead of removing it
  • Whole house fans – circulate outside air through home
  • Smart ventilation systems – selectively ventilate your home
  • Window film – reduces heat from sun coming indoors

Talk to an HVAC professional to find the best alternative cooling approach based on your climate and home setup.


What is air conditioner allergy?

Air conditioner allergy refers to allergic reactions triggered by airborne allergens or irritants that get circulated through an AC unit. Common triggers include pollen, mold, dust mites, and dry air.

Why does AC make me sneeze?

AC units can pull in pollen, mold, dust, and other allergens from outside air as it circulates through the system. Inhaling these particles makes some people sneeze due to an allergic response or irritation of the nasal passages.

Can AC cause chest tightness?

Yes, breathing in cold, dry air from an AC can cause chest tightness in some people, especially those with asthma or allergies. The sudden change in air temperature and humidity levels can trigger airway constriction.

Should AC vents be closed at night?

It’s generally not advised to close all AC vents at night, as this can strain the system. But selectively closing vents in bedrooms at night may help those sensitive to cold, dry air. Just be sure some vents stay open for proper air circulation.

Can AC cause eczema outbreaks?

Yes, extremely dry air from an AC unit may contribute to eczema flares in some people. Using a humidifier and applying moisturizer can help combat the drying effects.

What temperature should I set the AC for allergies?

The ideal AC temperature for allergy sufferers is around 77°F. Any lower can over-dry the air. Make sure to also use a dehumidifier to maintain a comfortable humidity level between 30-50%.

Can air conditioning cause pneumonia?

No, air conditioning itself does not directly cause pneumonia. But excessive coldness and dehumidification may make some individuals more prone to respiratory infections. Maintaining proper indoor temperature and humidity can help reduce this risk.

In summary, air conditioning allergies are real for a small portion of the population. Paying attention to air quality, ventilation, and humidity levels can go a long way in minimizing symptoms. For chronic sufferers, exploring alternative cooling solutions may be beneficial. With some care taken, staying comfortable is possible even with AC allergies or sensitivities.

Published by

Dennis Reed

Dennis Reed Owner and Author @