Best Humidifiers For Allergies – 2020 Buyer’s Guide

| Last Updated: May 26, 2021

Investing in a humidifier is one of the simplest and most effective ways to help mediate allergy symptoms that are worsened by dry air.

By using one in your home, you can improve the overall air moisture and quality to protect you and your family against airborne allergens and pathogens.

If you are not sure how to choose a humidifier or even if you need one in the first place, we are here to help.

Comparison of the Best Humidifiers For Allergies

  • Has a Great Evaporation Capacity
  • Can Operate in Either Automatic or Manual Mode
  • Whole House Humidifier With Easy and Simple Installation Process
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  • Efficient and Extremely Quiet Operation
  • One Refill Supports Up to 18 Hours of Runtime
  • Automatically Shuts Off When Water Level is Too Low
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  • Includes Three Different Mist Settings
  • Efficient and Long-Lasting Model Available at a Low Price
  • Noiseless 30 Hours of Runtime Produces One Gallon of Moisture
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  • Doesn’t Need to Be Refilled Too Often
  • Strong Circulation Capability With Three Power Settings
  • Easy to Operate and Set Up (Includes Clear Instructions)
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  • Purifies Air by Trapping Airborne Pollutants
  • Comes With Three Different Output Levels for Customization
  • Cold Evaporation Technology Prevents the Production of White Dust
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Pros and Cons of Using a Humidifier For Allergies

When it comes to humidity, balance is key. Using a humidifier to help protect against the uncomfortable symptoms of dry winter air is very effective. However, if you overuse it and create too much moisture, it can lead to different negative effects. For the best results, keep your home’s overall humidity level between 40-60%. Here are some of the pros and cons to help you in deciding if this is right for you.


Using a humidifier has many benefits. It can help the air feel warmer, prevent nasal irritation and dry skin, and improve your breathing comfort and sleep.

Improves Health

When the humidity level is lower than 40%, it can cause many annoying cold-like symptoms, including sinus congestion, runny nose, dry throat, and cough. Dry air can even lead to an actual cold because it makes it harder for your body to produce a healthy layer of mucus in your nose and throat, which helps protect you from infection.

Reduces Allergies

Some humidifiers are also able to trap and block airborne pollutants, such as pet dander and pollen, so they are less prevalent in your home. This is very helpful to anyone who suffers from allergies or asthma.  

Reduce Energy Usage

Using a humidifier helps the air in your home feel warmer, allowing you to set your thermostat to a higher temp in the winter and save electricity.


Below are some of the most common drawbacks:

Allows Growth of Dust Mites

If there is too much moisture in the air, it can create the perfect environment for dust mites and make it easier for them to grow. Dust mites are one of the most common indoor allergens, so fostering an environment where they can thrive can be very detrimental to those with allergies.


It is best to fill your humidifier with distilled or demineralized water if you can. Sometimes minerals in tap water can encourage bacteria growth. Make sure to consistently clean all parts of your humidifier and monitor it for mold. If bacteria or mold spores are given the chance to grow inside the water tank, the humidifier will then be spreading those harmful particles throughout your home.

Aspects to Consider Before Buying

Humidifiers come in a range of types and sizes with many different features that can impact how helpful they are. Before investing in one, consider the kind you want, how much space it can cover, and how easy it is to use and clean.


There are four main types: warm mist, cool mist, whole house, and ultrasonic humidifiers.

Warm Mist

As the name implies, warm mist humidifiers produce a warm mist that can be very soothing if you are under the weather. They tend to be quiet and usually produce clean air but require more maintenance.

Cool Mist

Cool mist humidifiers have a filter that traps minerals and pollutants. They output a very fine, cool mist and generally have better coverage. They are easy to clean but the filters need to be replaced regularly.

Whole House

Whole house humidifiers are the most heavy-duty option. They are designed to cover large spaces and often use tanks that only need to be refilled every few days. They can be pretty complicated to install, but once they are set up, they are an effective and efficient way to humidify the entire house with minimal maintenance.


Ultrasonic humidifiers work by vibrating a metal diaphragm at an ultrasonic frequency, which generates water droplets that are then output into the air using a fan. These models are basically noiseless and are relatively easy to clean.


Each model should tell you its coverage capability in square feet. Most single-room models can reach between 200 and 500 square feet, while some whole house humidifiers can reach over 4,000 square feet.


Keeping the humidifier clean is extremely important. If it is not properly maintained, mold and bacteria can build up and be dispersed into the air with the moisture. Some products use UV or Silver Clean Protection technology to help prevent bacteria growth.

Home Design

The way your home is designed factors into your decision. The square footage, layout, and occupied space will dictate the type and size of the product you need.

Review of the Best Humidifiers For Allergies

The ideal model will depend on your allergies, sensitivity, and the design of your home, so it is important to consider these factors before selecting a humidifier.

Aprilaire 700 Automatic Humidifier


  • Quiet Operation
  • Automatic and Manual Modes
  • Compact Unit With Impressive Reach
  • Easy to Set Up With Detailed Instructions
  • 0.75 Gallons Per Hour Evaporation Capacity


  • Some Installation Tools Need to be Purchased Separately

Our Review

At the top of our list is this automatic model from Aprilaire. It has one of the highest evaporation capacities of any humidifier, with the ability to evaporate up to .75 gallons of water per hour.

It is a whole house humidifier and is suited for spaces up to 4,200 square feet. Many whole house humidifier systems can be tricky to set up, but with this model, the process is fairly fast and straightforward.

Because it is automatic, it adjusts itself throughout the day and doesn’t need to be monitored or set. However, if you prefer to customize the settings yourself, there is a manual mode as well that allows you to change the temperature and relative humidity indicators. It operates quietly without a disturbing humming or mechanical sound.

This humidifier is also fairly compact. It measures 16x11x18 inches in size and weighs about 15 pounds.

Bottom Line

This model has an impressive evaporation capacity and reach that drastically improves the air quality in your home. Installing whole house humidifiers can be a little intimidating if you haven’t done it before and some may still prefer to have the help of a professional, but if you are up for it, this is a great one to start with because it provides clear and specific directions.

Optimus U-31002 1.5-Gallon Cool Mist Ultrasonic Humidifier , White


  • Easy to Use
  • Glows Blue at Night
  • Noiseless Operation
  • Auto Shut-Off Feature
  • 1.11-Gallon Water Tank Capacity With 1.5-Gallon Moisture Output


  • Tank Shape is Challenging to Refill and Clean

Our Review

Very close behind the Aprilaire version is the Optimus Ultrasonic Humidifier, which is perfectly suited for combatting the dry air and conditions that come along with the winter season.

The water tank has a capacity of 1.11 gallons that can turn into 1.5 gallons of moisture. There is an auto-shut-off switch that shuts down the unit and turns on a notification light when the water needs to be refilled. It also has a built-in handle. Each tank-fill generates about 18 hours of runtime so you can leave it on overnight without a problem.

Because of its Ultrasonic design, this humidifier is extremely quiet and creates virtually no noise.

Bottom Line

This humidifier operates almost soundlessly with the capacity to produce 1.5 gallons of mist over a course of 18 hours. It is a great option for dry winter months and you can keep it going all night long without any issue. The curved shape of the tank makes it difficult to refill and reach every corner when cleaning, which is something to keep in mind.

Best for the Money:
PureGuardian H940

Guardian Technologies Pure Guardian H940 Ultrasonic Cool Mist Humidifier, 30 Hrs. Run Time, 0.5 Gal. Tank Capacity, 350 Sq. Ft. Coverage, Small Rooms, Quiet, Filter Free, Silver Clean Treated Tank


  • 30-Hour Runtime
  • Great Value Option
  • One-Year Warranty
  • Silver Clean Protection Technology
  • Very Compact and Lightweight Design
  • Auto Shut-Off and Indicator Light for Refills


  • Limited Reach
  • Highest Level Sometimes Produces Heavier Condensation Instead of Thin Mist

Our Review

This humidifier is a great value with a low price tag and an efficient operation. The half-gallon tank allows it to run for 30 hours, so you can keep it going for an entire day without needing to worry about a refill. In those 30 hours, it outputs about one gallon of moisture.

It is designed to be used in small rooms and covers about 210 square feet. At such an affordable price, you could easily buy one for multiple rooms to battle the dry air and its effects throughout your whole home. The tank is embedded with Silver Clean Protection to prevent mold and mildew from growing on its surface.

It has three different settings ranging from the soothing low setting when you would like a little extra moisture to a high setting for when you need faster or stronger results.

Like the Optimus model, it is an ultrasonic humidifier and produces a thin mist with almost no noise whatsoever, making it the perfect option for night use. There is even an optional night light. It also has an auto-shut-off feature and refill indicator light.

Bottom Line

Overall, this model is a compact and affordable option that works well for combating allergens and dry air in small spaces. When it is on the low setting, it can run quietly all night without needing a refill. The embedded Silver Clean Protection makes it super easy to clean and prevents the buildup of dangerous mold that can make allergies worse for many people.

Best Cool Mist Humidifier For Allergies:
Vornado Ultra3

Vornado Ultra3 Whole Room Ultrasonic Humidifier


  • Great Circulation
  • Includes Long Cord
  • Noiseless Operation
  • Five-Year Limited Warranty
  • Clear Instructions and Easy to Use


  • No Auto Turn-Off Function (Fan Continues to Run Even When Water Tank is Empty)

Our Review

If you have bad allergies, a cool mist humidifier can help alleviate some of your symptoms. The Vornado Ultra3 uses a quiet and efficient ultrasonic system that can humidify up to 600 square feet. It has a one-gallon tank that can produce up to two gallons of mist throughout a 24-hour period.

It has an electronic humidistat and three different fan settings, including low, high, and automatic, so you can adjust it to fit your preferences or the conditions each day. The push-controls are backed with LED lights, so they are always easy to see and use. The unit comes with clear and detailed instructions to guide you through each step of setup and operation.

This model is also quite compact and lightweight. It measures 9.7x9x5.8 inches and weighs a little over seven pounds, so you can easily move it as needed. It has a long cord as well for added convenience.

Bottom Line

This model is able to output and circulate up to two gallons of fine mist in just 24 hours, making it an excellent option for those with bad allergies. It also has an impressive reach and is able to effectively humidify larger spaces. It does not have an auto-turn-off feature, but with a one-gallon capacity, you can use it for an entire day before having to refill.

Best for Allergies and Asthma:
 Venta LW25

Venta LW25 Original Airwasher in Black


  • 10-Year Warranty
  • Portable and Lightweight
  • No White Dust, Ions, or Ozone
  • Filter-Free and Quiet Operation
  • Extra Protection Against Air Pollutants


  • No Humidistat
  • Slightly Bulky and Basic Design

Our Review

For those with both allergies and asthma, dry conditions are frustrating at best and life-threatening at worst. To help protect yourself from allergens and dry air, use a model like the Venta LW25. It purifies and humidifies the air and does not produce any ions, ozone, or white dust. It offers extra protection against common allergens like dust, pollen, and pet dander because the pollutants are trapped by the rotating disks and stay in the water.

It is built to humidify up to 400 square feet, so it can work in larger rooms in your home like the living room or a master bedroom instead of just regular-sized bedrooms. Its two-gallon water tank allows you to run it for extended periods of time without needing a refill.

This model is very portable and compact. It weighs about 13 pounds. It also has three output levels so you can adjust it based on your own needs and preferences.

Bottom Line

With its cutting-edge features and Cold Evaporation technology, this product is perfect for those with allergies and asthma because it not only humidifies your home but also purifies the air and protects against airborne pollutants. The main issue you might have with this model is its old-fashioned design. It is a little clunky and does not have a humidistat, but despite these minor design flaws, it is a very effective humidifier and air purifier.

Best for Allergies and Sinus:
Honeywell HCM350W

Honeywell HCM350B Germ Free Cool Mist Humidifer White


  • Great Coverage
  • Quiet Operation
  • Three-Year Limited Warranty
  • Does Not Produce White Dust
  • Kills Bacteria and Mold in Water
  • Easy to Clean (Includes Dishwasher-Safe Parts and Antimicrobial-Treated Filter)


  • No Auto Shut-Off Feature
  • Non-Adjustable Output Settings

Our Review

This cool moisture humidifier is an excellent way to counter dry air and its negative effects on the body.

Not only does it efficiently humidify the space surrounding the unit, but it also uses UV technology to kill 99.9% of the bacteria and mold in the water, so you are breathing cleaner, safer air. It is also effective at removing airborne pollutants and allergens like dust particles and pollen, which will be a great help to those who suffer from allergies. It includes pieces that are dishwasher-safe and an antimicrobial-treated filter to make cleaning as simple and easy as possible.

When it is on the low setting, the humidifier can run consistently for 24 hours and can cover up to 500 square feet. The one-gallon tank allows it to output 2.3 gallons of moisture daily. It has an automatic control system that maintains a consistent rate of moisture output and prevents over-humidifying.

Bottom Line

The dedication to safety and sanitation is what sets this model apart. It is highly effective at humidifying the air to help protect your skin and sinuses in dry conditions and also has many features in place to protect against bacteria. If you are especially sensitive or suffer from allergies, this humidifier will help in multiple ways by removing mold spores and airborne pollutants from the air in your home. It is an automatic system, so it does not have adjustable output settings or an auto shut-off feature but does include a substantial one-gallon tank and is easy to operate.


When used properly, humidifiers can help alleviate the symptoms of asthma, allergies, and sinus sensitivity. Once you have the right model, it will greatly improve your overall health and comfort during the dry winter months.

People Also Ask

Still have questions? Scroll down to see our answers to FAQs on this subject.

How Often Should I Clean My Humidifier?

Humidifiers need to be cleaned regularly to prevent the growth of bacteria. If the humidifier has a filter and you use it every day, the filter should be changed weekly. If it does not have a filter, it is ideal to clean the humidifier after each use or daily, if you use it all the time. At the minimum, it should be thoroughly cleaned every 2-3 days.

Why Dry Air is Bad For Allergies and Sinus Issues?

Dry air can make it more difficult for your body to produce healthy mucus in your nose and throat, which help keep your sinuses working correctly and protect against airborne pathogens and allergens.

Do Humidifiers Really Help With Allergies and Sinus Problems?

As long as the overall humidity level does not exceed 60%, using a humidifier can be very effective in mediating the symptoms of allergies and sinus issues. If the level goes above that, it can begin to cause other problems. 

My name is Bob Wells and I am a retired HVAC tech from Washington state. I am currently retired and no longer do much with HVAC, however, I feel like I have a lot of knowledge in the subject and I wanted to create a website where I could talk about what I've learned and help upcoming HVAC techs. Find more info about me and HVAC Training 101.