Air Purifier vs Humidifier: Choose the Right Device for Your Home and Health

Air Purifier vs Humidifier: Choose the Right Device for Your Home and Health

Air Purifiers vs. Humidifiers: Enhancing Your Home's Air Quality

Air purifiers and humidifiers both contribute to improving indoor air quality, but what sets them apart? And is it possible to use them simultaneously? Many people rely on air purifiers, while others use humidifiers; some even incorporate both devices in their homes.

Air purifiers and humidifiers offer fantastic benefits for indoor air quality, but deciphering which option best suits your specific needs can be challenging. Both products provide relief for individuals with sinus and respiratory issues, yet the relief mechanisms differ significantly.

So, what characteristics make these devices similar, and what sets them apart?

If you're captivated by the air purifiers vs. humidifiers debate, you're likely curious about their respective impacts on air quality. Additionally, you may be uncertain about how each device functions. In this comprehensive guide, we'll delve into the differences between air purifiers and humidifiers, helping you gain a clear understanding of how these powerful machines operate.

By the end of this article, you'll confidently determine whether your home needs an air purifier, a humidifier, or both.

Grasping the distinctions between top air purifiers and humidifiers is vital for making the best decision for you, your family, and your home. For a more in-depth analysis, check out our investigation on how air purifiers work.

Air Purifier vs. Humidifier: Uncovering the Differences

At first glance, air purifiers and humidifiers may appear strikingly similar; however, their internal mechanisms greatly differ. While one device sanitizes the air by eliminating allergens, the other introduces additional moisture to alleviate irritations caused by dry air.

The primary distinction between an air purifier and a humidifier lies in their functions. Air purifiers are engineered to filter out allergens, dust, mold, and neutralize odors, whereas humidifiers regulate a room's humidity level without affecting air quality or particle concentration.

Direct Comparison

This chart will give you a quick overview and comparison between air purifiers and humidifiers.


Air Purifier



Uses filters to trap and remove airborne contaminants

Adds moisture to the air to soothe irritation caused by dry conditions


Beneficial for asthmatics and allergy sufferers, and people who want clean air

Beneficial for asthmatics and people with irritated respiratory tracts due to dry air


Allergens, Dust, Pet Dander, Mold Spores, Bacteria, and Smoke

Dry Air



30% to 50%

Distinguishing Between Air Purifiers and Humidifiers

It's essential to understand that air purifiers and humidifiers serve different purposes and cannot be used interchangeably.

Air Purifier

So, what does an air purifier do? The primary function of an air purifier is to eliminate various contaminants from indoor air. It captures and neutralizes dust particles, bacteria, allergens, mold spores, pet dander, smoke odors, and other harmful particles. As the air purifier operates, it draws air from your home into the device and processes it through a series of filters.

A prevalent filter type is the HEPA filter, capable of capturing minuscule particles as small as 0.3 microns. Although the True HEPA version is 99.97% effective at removing airborne contaminants, there are notable drawbacks associated with using HEPA filters.

Air Purifier vs Humidifier: What Are The Differences?

If you’re wondering what are HEPA filters, they are a tightly woven set of plastic and fiberglass threads that allow air to pass through while trapping particles that are larger than the openings within the material.

Keep in mind that an air purifier doesn’t add any moisture back into the air. It only functions to clean and filter out the pollution.

HEPA filters, if you're unfamiliar, consist of tightly interwoven plastic and fiberglass threads. These materials permit air to flow through while trapping particles larger than the filter's openings.

It's crucial to note that air purifiers do not add moisture to the air; their sole purpose is to clean and filter out pollutants.


The primary function of a humidifier is to reintroduce moisture into your home's air. It achieves this by releasing vapor into a room, which may be visible or not. This is in contrast to a dehumidifier, which removes water vapor from the air.

To keep a humidifier operational, you must consistently add water to a reservoir. The device then transforms the water into a fine mist before dispersing it into the surrounding air.

Humidifiers are most effective in arid climates, as they replenish moisture in the air, potentially alleviating dry skin, throat irritation, sinus issues, nosebleeds, and breathing difficulties associated with dry environments.

Air Purifier vs Humidifier: What Are The Differences?

It's crucial to recognize that a humidifier increases a room's relative humidity level. Excessively high humidity levels can promote mold growth; hence, it's best to maintain indoor humidity between 30% and 50%. Below 30% is deemed too dry and can cause issues like those mentioned earlier, while over 50% humidity can foster mold growth, dust mite reproduction, and mildew. 

If you're unable to sufficiently lower humidity levels, it's advisable to use an efficient air purifier for mold spores to extract fungi from the air.

Types of Air Purifiers

Air purifiers come in various forms, and each unit may feature one or more of the following air-cleaning functions:

  1. HEPA Filtration: This highly dense filter traps airborne contaminants. The True HEPA filter is prevalent in air purifiers because it's certified to remove 99.97% of all particles as small as 0.3 microns. It's effective for eliminating allergens, particulate matter, dust, visible smoke, and pet dander, but not for viruses and bacteria. HEPA filters require replacement every few months and are non-recyclable, posing a serious risk for the environment.

  2. Carbon Filtration: This filter employs a unique form of activated carbon to capture gases, odors, chemicals, and volatile organic compounds (VOCs). It helps maintain a fresh-smelling home and reduces toxic substances in the air. Carbon filters are primarily used to eliminate odors, but their efficacy in filtering VOCs, viruses, and bacteria is relatively low.

  3. Negative Ionization: This air-cleaning technology releases charged ions that attach to airborne contaminants, weighing particles down for easier capture by internal air filters and causing pollutants to fall onto the floor. This process is especially effective at removing ultra-fine particles, down to 0.01 microns in size.

  4. Ultraviolet (UV) Light: This system uses a special light capable of killing airborne bacteria and viruses by destroying their molecular DNA structure. As air passes through the air purifier, the UV light neutralizes microorganisms and pathogens, ensuring the air re-circulated into the room is sterilized and clean. This technology has grown exponentially in recent years due to its superior effectiveness compared to both HEPA and Negative Ionization filters.

Air purifiers can be portable or whole-house air purification systems. We particularly recommend portable air purifiers for their lower cost and efficiency in single rooms.


Types of Humidifiers

Humidifiers are available in three common varieties:

  1. Warm Mist: These humidifiers utilize a gentle boiling process to heat water, producing a warm mist that is visible and tangible in the air.

  2. Cool Mist: These humidifiers feature a filter that captures sediment, minerals, and other impurities while emitting a cool, invisible mist that evaporates into the air.

  3. Ultrasonic: These humidifiers employ a metal sheet that vibrates at an ultrasonic frequency. This process generates water droplets, which are then propelled into the air by a fan, creating a cool, ultra-light mist that rapidly disperses humidity throughout the room.

How Do Air Purifiers and Humidifiers Affect Your Health?

Air purifiers and humidifiers have a significant impact on indoor air quality, which in turn affects our health. While both devices treat the air we breathe, they do so in distinct ways.

To determine which device is most beneficial, we must first identify the underlying causes of the symptoms that need to be addressed.

Air purifiers extract small particles from the air and capture them in a series of filters. This process helps reduce allergens in the air, including dust mites, pet dander, pollen, and mold spores. Some air purifiers can also eliminate volatile organic compounds (VOCs), which are toxic substances found in many everyday cleaning products.


Air Purifier vs Humidifier: What Are The Differences?

Humidifiers don't actively clean the air, and they don't impact the number of airborne allergens. These devices simply add moisture to the air. Using a humidifier to increase humidity in a room can alleviate symptoms such as a stuffy nose, itchy throat and eyes, dry skin, and hair. By maintaining a humidity level between 40% and 60%, you can also reduce the potency of airborne viruses.

If dry air in your bedroom contributes to snoring, adding a humidifier can help stop or reduce snoring by moisturizing nasal cavities. Humidifiers can even help prevent nosebleeds caused by dry air.

Which is Better for You: An Air Purifier or Humidifier?

An air purifier might be best if:

  • You suffer from asthma, allergies, or a respiratory condition irritated by polluted air.
  • You want to decrease the amount of pet dander or allergens in your home's air.
  • You want a good dust remover machine to reduce indoor dust accumulation.
  • You want to eliminate household odors from cooking, pets, smoke, or mold.
  • You want to reduce the level of toxic substances in the air you breathe.
  • You want to sleep better at night with less lung, throat, and nose irritation.
  • You want a cleaner, more sterilized home environment.

A humidifier might be best if:

  • You live in a dry or arid climate.
  • You want to increase the moisture levels in your home's air.
  • You have frequent nosebleeds or sinus issues aggravated by dry air.
  • You have dry skin, hair, or eyes during the winter.
  • You want relief from respiratory issues caused by dry air.
  • You have excessive snoring at night due to dry air conditions.

    Frequently Asked Questions

    Can you use a humidifier and air purifier in the same room?

    Yes, you can use an air purifier and humidifier in the same room and even at the same time. Each device serves a different purpose: the air purifier cleans the air of pollutants, while the humidifier adds moisture to the air for increased comfort.

    Do humidifiers clean the air?

    No, a humidifier does not clean the air. However, it serves a valuable function in the home by adding moisture to the air to improve humidity levels. This can make the air more comfortable and easier to breathe compared to dry air.

    Do humidifiers help with dust?

    No, humidifiers do not help with dust. A humidifier adds moisture to the air and has no effect on cleaning the air from dust particles. If the humidity level is not maintained between 30-50%, using a humidifier can create a suitable environment for dust mites to thrive.

    Air purifier vs. humidifier for a baby: which is better?

    Both devices can be beneficial. An air purifier provides cleaner air in the baby's room, promoting better health. If the air is dry, a humidifier adds moisture, making it easier for your baby to breathe and feel more comfortable, and helping to reduce cough and cold symptoms. A cool-mist humidifier may help shrink nasal passages for easier breathing, while a warm mist humidifier might cause swelling of the nasal passages, making breathing more difficult.

    Placing an air purifier in the baby's room helps keep the air clean and removes unwanted particles such as toxins in tobacco smoke, gases emitted by some plastics, mold spores, pet dander, and pollen. These contaminants can contribute to cold and flu illnesses.

    Air purifier or humidifier for asthma?

    Both devices can be helpful, but an air purifier is generally the better choice for people with asthma.

    An air purifier removes common asthma triggers from the air, preventing inhalation. While a humidifier doesn't remove these triggers, it can make the air more pleasant to breathe. For individuals with asthma, a humidifier may ease symptoms caused by dry air but it won't cure asthma or prevent an attack.

    Keep in mind that if you use a humidifier for a prolonged period and increase the humidity level above 60 percent, it may worsen asthma symptoms or trigger an attack. High humidity levels can promote the growth of harmful bacteria, dust mites, and mold. Therefore, an air purifier is generally a better option for asthmatics in the long term, as removing pollutants from the air reduces the chance of triggering an attack.

    Air purifier or a humidifier for allergies?

    An air purifier is the best option for allergies. Air purifiers remove dust, pollen, pet dander, mold spores, and other allergens from the air, preventing them from irritating your eyes, throat, or lungs. A humidifier doesn't remove these allergens and may actually increase them if the humidity level gets too high.

    If reducing allergens is your goal, then an air purifier is the better choice. Using a high-quality, sustainable filter will help trap allergen microparticles smaller than 0.3 microns in size.

    Humidifiers, on the other hand, can make allergies worse. The added humidity can help dust mites survive and mold grow. With a humidifier running, the air quality remains the same, with only more moisture added.

    A Conclusive Note

    By now, you should know which device will work better for your circumstances when choosing between an air purifier and humidifier. As you've learned, both a humidifier and air purifier for home can be beneficial for your health. In many instances, people choose to use both indoors to get the comfort and relief they need.



    Back to blog

    Leave a comment

    Please note, comments need to be approved before they are published.