Best Large Room Air Purifiers In 2021

There are a lot of reasons to go with a large room air purifier. It solves one of the common mistakes in air purifier ownership where people underestimating the room size. With the wrong model, it can be underwhelming as not all airborne impurities can be removed. But which is the best large room air purifier? Can I use it in a small room? What other features do I need to look out for? Every question shall be answered plus our thoroughly researched and reviewed list. Let's begin.

Who is this for?

Perfect if you have a large room size like the living room, dining hall, basement, meeting room, or master bedroom. Also useful if you intend to use it to cover multiple rooms with doors open. A large air purifier is also ideal for a person with asthma or hypersensitive to dust, mold, and other allergens. Finally, the versatility as a large air purifier can be fitted in a small room but a small air purifier can't be fitted in a large room.

2021 Best Large Room Air Purifiers

NoImageAir PurifierOnline Price (Amazon)Room SizeFiltrationCoverageScore
1Blueair Pro XLBlueair Pro XL Air Purifier


1180 square feet3-stage1180 sq. ft. (110 m2)5
2Airmega 400SAirmega 400S Air Purifier


1560 square feet4-stage1560 sq. ft. (145 m2)4.5
3Alen BreatheSmart HEPA Air PurifierAlen BreatheSmart Classic Air Purifier


1100 square feet3-stage1100 sq. ft. (102 m2)4.5
4Rabbit Air MinusA2 SPA-780ARabbit Air MinusA2 SPA-780A Air Purifier


815 square feet6-stage815 sq. ft. (76 m2)4.5
5IQAir HealthPro Plus Air Purifier


1098 square feet4-stage1098 sq. ft. (102 m2)5
6Blueair Classic 605Blueair 605 Air Purifier


775 square feet3-stage775 sq. ft. (72 m2)5

How Do We Measure?

Room size If you need to purify the air of 700 square feet space, you will need an air purifier capable of covering such a large room. That's why the air purifier we are looking for has to have a minimum coverage of 700 sq. ft. with 2 air changes per hour. the bigger the applicable area, the higher priority with be given to the model.
Dimension and noise level All large air purifiers are fairly substantial and will definitely take up a lot of your interior space. The noise it produced will also impact its usability, especially during night time. Bonus point will be given to the model that produces the least amount of noise and a smaller dimension.
Filters, price and upkeeping It makes sense why a large air purifier would cost that much. It utilizes a bigger motor fan, it has bigger and more filters to support stronger filtration. It also houses more features than average models. We will judge the air purifier based on the filter quality, the performance output, price tag, and the filter cost.

Let's start with the reasons why you should buy this large room air purifier. Blueair Pro XL is a reputable Swedish brand that is known for making quality air purifying products with premium materials. it delivers a powerful 990 cfm airflow that no competitor can ever churn out that much power. Not even close. The combined HEPASilent Technology and unrivaled dust 950 cfm can pull in microscopic particles even from far. Dust mites, pet dander, tobacco smoke, odors, bacteria, and viruses will all be removed from the air as long as the pollutants are within the 1150 sq. ft. zone.

So why you shouldn't buy this air purifier. First off, the 2k price tag has definitely go through the roof. Then there is the large Trio Blueair Pro particle filter and SmokeStop filter that require replacing every 6-12 months. Noise level is loud but understandably so given the output, but it doesn't make sense that you should pay extra for the Air Intelligence Module. All premium air purifier comes with a built-in air quality sensor by default. Still, if you want a reliable air purifier that holds the Blueair brand, the classic Blueair 605 will do just fine (more on this later).

What's cool:

  • Support room size up to 1180 square feet or 110 m2.
  • 210-990 cfm max airflow delivery rate.
  • Super high CADR output with dust (950 cfm), pollen (900 cfm), smoke (800 cfm).
  • 3X Pro Particle filter and 3 Pro SmokeStop Filter.
  • 5 years warranty.

What's not:

  • Cost more than 2000 dollars excluding the Air Intelligence Module addon and filter replacement cost.
  • 32 - 58 dB(A) noise level is not the worst but definitely not subtle either.
  • Extremely heavy at 71 lb. Not easy to move around.
± 2,427.00 p
     Annual filter ^    
± 540 - 1080 p
 Online price*

Airmega 400S is the king of extra large room air purifier for a good reason. It has the best room space coverage up to 1560 sq. ft. at 2 air changes per hour. That's not the only strong suit the air purifier has. The excellent 4-stage Max2 filtration comes with dual pre-filter, True HEPA filter, and an activated carbon filter. At an overall CADR of 350 cfm, it is perfect to capture all types of pollutants including dust, germs, cooking smell and odor. Airmega 400S is also well-equipped with features like air quality indicator, auto mode, sleep mode, and eco mode. The S variant is Wi-Fi enabled, therefore it supports remote access via Airmega apps and will work with Amazon Alexa. You learn more about the app features in the product link page.

There are 3 more variants in Airmega series: 400, 300S, and 300. Obviously the 400 series would be the best pick for a large air purifier as it can cover more areas. The non-S version comes without Wi-Fi support at a cheaper price. Regardless of which version you go for, the bulky size and noise level are relatively similar so take that into consideration.

What's cool:

  • Support room size up to 1560 square feet or 145 m2.
  • Consistent and powerful airflow delivery rate.
  • High 350 cfm clean air delivery rate.
  • 4-stage filtration with Max2 Green True HEPA filter + activated carbon filter.
  • 5 years warranty.

What's not:

  • Expensive although you can easily find many great deals online.
  • Can be loud if you leave it at 52 dB max noise level.
  • Slightly tall and bulky but the 24.7 lb weight is nothing compared with Pro XL.
± 749.00 p
     Annual filter ^    
± 130 p
 Online price*

The only large room air purifier here that comes with a lifetime warranty. Alen BreatheSmart 1100 square feet coverage is the main reason we pick this over the others. That said, BreatheSmart air purifier does way more than that where it even outshines features from Blueair. Starting with the customizable filters, you can upgrade from the classic HEPA-pure to either HEPA-Silver that is perfect for asthma, HEPA-FreshPlus that specializes in chemical, VOCs, and HEPA-OdorCell that focus on smoke, pet, diaper odors. Supporting the strong filtration is an ionizer which is not available in Airmega and a verified 300 cm clean air delivery rate. Alen BreatheSmart also comes with all the practical features like auto mode, sleep mode, AQ indicator, and timer. There's even space for aesthetic enhancement panel if you choose to.

For an air purifier that is meant for a large room, there's little fault you can find in Alen BreatheSmart. The pricing might be slightly expensive, the noise level is not subtle, and the overall dimension is not the smallest. We will look aside all that as it has zero impact on its performance in big spaces. Just remember to go with the classic BreatheSmart than the smaller Fit50 or Flex.

What's cool:

  • Cover room size up to 1100 square feet or 102 m2.
  • 150-286 cfm airflow delivery rate.
  • High (dust, pollen, smoke) 300 cfm CADR output.
  • Customizable HEPA filter (4 options) with Ionizer.
  • Lifetime Limited Warranty.

What's not:

  • Pricing can be expensive depending on the trim level.
  • 42-56 dB noise level can be loud at times.
± 649.00 p
     Annual filter ^    
± 46 - 138 p
 Online price*

Rabbit Air MinusA2 is our best large room air purifier that takes up the least amount of space. It comes with a comprehensive 6-stage filtration that no other competitor models can mimic. First, you have the pre-filter and medium filter that deals with dust, hair, debris, and other bigger particulate matters. The irritants that manage to bypass the 2 filters with now be trapped by the BioGS HEPA filter at 99.97% efficiency. Since HEPA filter cannot capture smoke particles, the activated carbon filter will come into play to absorb any musty and toxic odors. To further ensure to harmful contaminants are left out, there are 4 customizable filters that can tackle hard to remove allergens. Choose from Germ Defense Filter, Pet Allergy Filter, Toxin Absorber Filter, and Odor Remover Filter. Lastly, a negative ion generator would be in place to help pull the allergens down for the filter to capture.

Rabbit Air MinusA2 average CADR and 815 sq. ft. coverage may not be the greatest air purifier for large spaces, everything else about the air purifier is perfect. You have all the bells and whistles an air purifier has to offer plus filter replacement cost that is moderately priced. This is also the only air purifier here that you can hang to a wall. Talk about standing "up".

What's cool:

  • Cover room size up to 815 square feet or 76 m2.
  • Delivers an abundance of power between 58-218 cfm airflow.
  • Decent dust 193 cfm, pollen 200 cfm, smoke 180 cfm.
  • 6-stage filtration including HEPA, Medium, Activated Carbon, and Negative Ion Generator.
  • 5 years warranty.

What's not:

  • Expensive but comes with a low filter replacement cost.
  • Not suitable for extra-large room size.
± 599.95 p
     Annual filter ^    
± 43 - 85 p
 Online price*

IQAir was one of our earlier large room air purifiers pick and even after so many years and increment updates, it is still featured in the list. What makes IQAir HealthPro Plus great in large spaces is not the 1098 sq. ft. coverage but rather the award-winning filtration. Combining PreMax Filter, HyperHEPA Filter, and V5-Cell Gas & Odor Filter MG, there is nothing the air purifier cannot capture. From dust mites, mold, smoke, germs, bacteria, and viruses, HealthPro Plus can remove airborne particles as small as 0.003 microns. That's 100 times smaller than a standard HEPA filter with the support of a strong 300 cfm airflow. Adding from all that, you have premium perks like 6 fan speed, individual certified filter, and airflow performance that you will not find it elsewhere. I guaranteed.

The strong suit of the air purifier is also its downfall. HealthPro Plus is a Switzerland built air purifier with Swiss quality and a Swiss price. The outstanding HyperHEPA filtration set is also expensive to replace. Perhaps the most cumbersome factor is the bulky and heavy body. The 35.3 lb impact resistant ABS plastic and zero-leak triple-seal technology can be tricky to move around. If you don't mind all that, you will have yourself an excellent large room air purifier for many years to come.

What's cool:

  • Support room size up to 1098 square feet or 102 m2.
  • Trap particles as small as 0.003 microns size.
  • Decent power at 41-300 cfm airflow delivery rate.
  • 4-stage with PreMax Filter F8, HyperHEPA filter, V5-Cell Gas & Odor Filter MG.
  • 3 years warranty (10 for some countries).

What's not:

  • Around 900 with no discount.
  • Expensive filter replacement cost.
  • big, bulky, and heavy.
± 899.00 p
     Annual filter ^    
± 152 p
 Online price*

Like Blue Air Pro XL but can't justify paying that much for it, then Blueair Classic 605 is the perfect model for all. Blueair 605 is cheaper to own and maintain with all the same Blueair goodness. It is still powered by the same HEPASilent technology and made by the same manufacturer. The air purifier can still cover for large room size but at a slightly smaller 775 sq. ft. and 650 cfm max airflow. It can remove the same type of airborne pollutants including germs and chemical fumes. Therefore you should pick Blueair Classic 605 over the Pro XL unless money is not an issue.

The cons? The price like every other air purifier for large room here. We mentioned Blueair 605 is cheaper than Pro XL but that does not mean it is cheap. Not only the price tag is high, but the filter replacement cost is absurdly expensive as well. The lack of supporting feature is also something all Blueair model is known for. Lastly, noise level and the dimension can also be a problem but it is incomparable to the pricing.

What's cool:

  • Support room size up to 775 square feet or 72 m2.
  • HEPASilent Technology.
  • Excellent dust (500 cfm), pollen (640 cfm), and smoke (500 cfm) CADR output.
  • Up to 5 years warranty.

What's not:

  • Very expensive with air quality monitor and Auto mode not bundled in.
  • Very high filter replacement cost.
  • Noisy at max speed 62 dB(A).
  • Bulky and heavy steel body at 35 lb weight.
± 829.99 p
     Annual filter ^    
± 230 - 460 p
 Online price*
** MRSP (Manufacturer's Suggested Retail Price)/ RSP (Retail selling price) is provided by cleanairprice.com. Accurate at the time of posting.
^ Annual filter cost is calculated based on filter price and 12 hours of usage. Pricing could vary depending on air quality, usage frequency, and speed.


What Is The Best Air Purifier For 1200 sq. ft.?

The best air purifier for 1200 sq. ft. would be Airmega 400/ 400S. Ideal for living room, meeting room, or lounge, the robust airflow delivery rate and 300 cfm CADR can cover up to 1560 square feet of room space. Supporting the strong airflow is the outstanding Max2 True HEPA filter and activated carbon filter. Combining the high filter density, Airmega 400S air purifier can effectively trap dust, mold, pollen, smoke, and odors suspended in the home.

What Is The Best Air Purifier for 2000 Square Feet?

The best air purifier for 2000 sq. ft. would be Airpura UV600. It is portable and comes in multiple fan speeds that deliver up to 560 strong airflow output. The air purifier can also run at low speed for a quieter ambiance. Airpura UV600 can also cover a lot of grounds as airborne contaminants will be swiftly removed from the air. Perfect or large spaces like living hall or meeting room.

Particulate Matter Sizes

We all know there are many indoor pollutant sources in the air. What we might not know is these pollutants combined different types of particulate matter in various sizes. Particulate matter is the entirety of harmful solid and liquid droplets suspended in the air. Inhaling to these particles can be dangerous to our health even in a small concentration level. Microscopic particles that are less than 10 micrometers (μm) can travel from our lungs to other parts of the organs via the bloodstreams. Here is a quick comparison of the most common indoor particulate matter sizes.

  • Dust (about 5 microns)
  • Dust Mites (10-300 microns)
  • Mold (3-100 microns)
  • Bacteria/ Viruses (0.1-60 microns)
  • Plant Spores (3-70 microns)
  • Pet Dander (2.5-10 microns)
  • Pollen (10-1000 microns)
  • Fungi (3-100 microns)
  • Cigarette Smoke (0.01-1 microns)

The best large air purifier can remove every particulate matter above with a HEPA filter. For smoke particles, the air purifier must be equipped with a carbon filter to absorb the toxic fumes.

What Are The Best Types of Air Purifiers?

Without a shadow of a doubt HEPA air purifier is the best air purifier to go for. There are a few common types of home air purifiers that vary in different sizes and different purifying technology. Some are more efficient over the others but have to compromise with a higher price tag or usability. Regardless which type of air purifiers, go through the options carefully before choosing the best air purifier for large room.

  • HEPA air purifier - An air purifier that uses HEPA filter to trap microscopic particles as small as 0.3 microns at 99.97% efficiency. It is the most effective and reliable option that even comes with a certified performance on its filter. The only drawback is the price tag where the HEPA filter can be a hassle and costly to replace.
  • Carbon air purifier - An air purifier that uses activated carbon filter to capture smokes, chemical fumes, and odors through absorption. It is the complete opposite of the HEPA filter where it only focuses on smoke particles.
  • UV air purifier - Uses ultraviolet light to sterilize microorganisms and germs by destroying the cell. UV light is 100% proven, safe, and very effective in killing bacteria and viruses. However, the UV light efficiency will decrease over time and it is not very effective against other forms of contaminants.
  • Ionizer - A filter-free purification that releasing negative ions into the air. The negative ions will electrostatically merge will positive ions irritants causing them to fall from the increased weight. As long as the ionizer stays on, the ionization cycle will continue to remove airborne irritants in the air. Ionizer may not be as effective as a HEPA filter, is it eco-friendly and safe because it only releases negative ions.

Notice we did not include an ozone generator or Ozonator in the list. Ozone generator is a controversial device that generates ozone to purify the air. In theory, ozone can remove odors in the air by splitting the oxygen molecules of the allergens. The main issue is ozone itself is very harmful that can cause irreversible damage to the lungs. Having an ozone generator in your home can be more dangerous than not having any air purifier at all. So no matter which type of air purifier you intend to place in a large room, never go with an ozone generator.

Should I Leave Air Purifier On All Day?

Yes, you should leave the air purifier running all day every day even when you're not at home. HEPA air purifiers are designed to operate 7 days a week safely even when you're away for home or sleeping. This is because airborne pollutants will slowly build up over time when you turn off the air purifier. With an air purifier running 24 hours a day, clean air will be maintained by continually trapping harmful particulates.

Can I Use a Small Air Purifier in a Large Room?

A small air purifier would not be effective in a large room as it would take an extended period of time to clean the air. Every air purifier is rated on how much it can cover a designated room space between 1 to 5 air changes per hour. For example, a small air purifier that is designed to cover for a 100 sq. ft. room size at 2 air changes per hour may take twice the amount of time to cover a 200 sq. ft. room size. For an asthmatic or hyperallergic person that needs 4 air changes per hour, you will need to further double the amount of time to cover a room. To conclude, a large air purifier is needed to cover a large room.

Can An Air Purifier Be Too Big For a Room?

A large air purifier is always better than a small air purifier as it can cover more space due to the stronger airflow output. With a large air purifier, you can even cover multiple rooms next to each other with open doors. That said, the physical dimension of a large air purifier can be big and cumbersome to fit into a small room.

What To Consider When Buying An Air Purifier for Large Room

Most people focus only on airflow circulation when buying a large room air purifier. There are other couples of things that play a key role in how an air purifier works in a large room space. Neglecting these few factors will hinder the overall efficiency of the purification. To help you choose the right size model regardless of the ceiling height, interior design, and room size, look out for the features below:

  • Room size - The first step you will need to do is measure the room size you need the air purifier to clean the air. Once you have the square footage of the room, you can easily compare air purifiers that can cater to the room space. When choosing one, go above the manufacturer's recommended room size as the numbers are set in the most ideal environment.
  • Cost of ownership - A large air purifier can be very costly to own and maintain. You could be paying from 500 dollars to more than 2000 dollars for a full-size machine. Then there is also the filter replacement cost that will be another few hundred dollars to stack up annually. Consider all this when buying one.
  • Size and weight - All large air purifiers have a big dimension in order to accommodate the large motor fan and filters. The extra rigidity and sealed framework also pushed the weight beyond 20 lb. Pick something you are comfortable with that can fit into the spot you intend to place it. Rabbit Air Minus A2 is a good example of a good large air purifier that takes up little space.
  • Pre-filter - The first-stage filtration that blocks out dust, fur, debris, and hair. Most pre-filter are washable so you can reuse it over and over again to bye washing away the captured dust particulates.
  • HEPA filter - The most important filter in the filtration setup. A HEPA filter can trap harmful particles like dust mites, mold, pollen, pet dander, germs, and bacteria. Only go with True HEPA filter that captures particles as small as 0.3 microns with 99.97% efficiency.
  • Activated Carbon filter - Another key filter that targets specifically on smoke and odors. A good carbon filter will trap all types of smoke particles from cooking, cigarette, to chemicals like VOCs, CO, radon. It can also help your home smell better by removing odors from pet, diaper, cooking, and tobacco smoke.
  • Airflow delivery rate - For this we will either look into the clean air delivery rate (CADR) or the airflow output. Obviously the higher the ratings, the more airborne particles can be pulled in and remove from the air. Keep in mind that some air purifiers may have poorer ratings because of its filtration setup not because of the airflow performance.
  • UV-light - A supportive filtration that is very effective against microorganisms. Uses short-wavelength ultraviolet light to kill germs, bacteria by damaging the nucleic acids and disrupting their DNA.
  • Ionizer - Release millions of negative ions to merge with positive ions contaminants. The combined ions will fall due to the heavier weight thus allow an easier capturing by the air purifier.
  • Power consumption - Expect an annual electricity bill between $30-100 depending on the operational hours. Most air purifiers catered for large room will use a lot of electricity due to the high power output. If you are particular in this, look for an energy-efficient unit with an Energy Star certification.
  • Noise level - On average, a large air purifier will produce noise level between the range of 20 dB to 60 dB. If you are worried about the loud noise, keep the air purifier at low speed or move it further away but still within the distance of the intended room to purify.
  • Auto mode - Via in built-in sensor, automatically adjusts the fan speed based on surrounding air quality. Help save electricity and keep the noise level down to reduce distraction.
  • Sleep mode - Set the air purifier to the lowest speed and dim the display light. For those that come with a light sensor, Sleep mode will activate automatically when the room turns dark.
  • Warranty - Most large air purifiers offer a comprehensive 5 years warranty on parts and labors. That said, the brand reputation is very important as you can predefine the air purifier's durability and after sales service. If the brand has a poor record in servicing their products, it is best to avoid them to avoid future headache.

Max Fernandez

A loving father and a dedicated reviewer for airfuji.com with more than 1000 air purifiers under his belt. Max Fernandez is also one of the million patients currently suffering from asthma. Feel free to nudge him if you have any questions.