Best air purifier for large rooms

Do you have a large room in your house, office, or apartment that you want to get fresh and clean?

Are you looking for an air purifier for large space that can handle the demands of a high volume of air?

If so, you’ve come to the right place.

We’ll show you how to find the best air purifier for large spaces so you can get rid of indoor contaminants that may be harming your health.

You’ll also learn how to get a unit that can remove odors and make the air smell clean again.

Shopping for the best large room air purifier is a bit different than purchasing a smaller unit, so we want you to be well prepared for the task.

So keep reading to find out everything you need to know about buying the best air purifier for large rooms (and extra large spaces).

Disclosure: Home Air Guides is reader-supported. As an Amazon associate and affiliate for independent brands, we earn from qualifying purchases made through the links on our site. Learn more.

The Best Large Room Air Purifiers: Overview

Here’s a quick comparison chart showing the top large room air purifiers. We’ll cover each aspect of these units in the reviews section below, but this gives you an idea of what’s available and an easy way to compare them.

ImageAir Purifier DetailsPrice
Rabbit Air MinusA2 Air PurifierRabbit Air MinusA2 Air Purifier
  • Best overall air purifier with customizable features
  • Filters: Pre-filter, Medium, BioGS HEPA, Customized, Activated Carbon, Ionizer
  • Coverage: 700-815 sq. ft.
Check Price
Alen BreatheSmart Air Purifier
  • Another good unit with some customization options
  • Filters: 4 types of True HEPA
  • Coverage: 1,100 sq. ft.
Check Price
Medify MA-40 Air Purifier
  • Most popular unit with a medical-grade HEPA filter
  • Filters: Pre-filter, H13 True HEPA, Activated Carbon, Ionizer
  • Coverage: 840 sq. ft.
Check Price
Molekule Air Purifier
  • Advanced particle-destroying technology for large spaces
  • Filters: Pre-filter, PECO nanotechnology
  • Coverage: 600 sq. ft.
Check Price
IQAir HealthPro Plus Air Purifier
  • Highest-grade HEPA filter available for large rooms
  • Filters: HyperHEPA, V5-Cell Odor & Gas
  • Coverage: 1,125 sq. ft.
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AIRMEGA Air Purifier
  • Most powerful unit with Wi-Fi control
  • Filters: True HEPA, Activated Carbon
  • Coverage: 1,256-1,560 sq. ft.
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Austin Air HM400 Air Purifier
  • Has the thickest filter for removing odors and VOCs
  • Filters: True HEPA, 15 lbs. of Activated Carbon
  • Coverage: 1,500 sq. ft.
Check Price

Below you’ll find a list of the best air purifiers for large spaces.

We’ve included the top units for large rooms between 600 to 1,560 square feet.

That way you can narrow down the models that at least meet your minimum coverage needs and then let the filters and features determine your final pick.

The Best Air Purifiers for Large Rooms

1. Rabbit Air MinusA2 Air Purifier

Rabbit Air MinusA2 Air Purifier

If you have a room that’s not too overly large, then this Rabbit Air MinusA2 air purifier is a great option, as it covers 700 to 815 square feet.

It comes in three different models depending on the amount of coverage you need:

  • SPA-700A (covers 700 square feet)
  • SPA-780A (covers 815 square feet)
  • SPA-780N (Wi-Fi version that covers 815 square feet)

What makes this air purifier a great buy is that it offers unmatched air cleaning performance.

It strips practically every harmful particle from the air.

If you have allergies, asthma, or other sensitivities, it can reduce the contaminants that irritate you the most.

This air purifier also excellent for filtering out tobacco smoke and its odors as well as volatile organic compounds (VOCs).

The six-stage air purification process includes:

  1. Pre-filter: Traps the largest particles and extends the life of the other internal filters.
  2. Medium Filter: Traps large allergens and dust.
  3. BioGS HEPA Filter: Collects 99.97% of pollutants down to 0.3 microns. Specially designed True HEPA filter that lasts up to 3 years.
  4. Activated Carbon Filter: Traps odors and VOCs.
  5. Customized Filter: Let’s you tweak the air purifier to suit your specific needs. Choose between Enhanced Germ Defense, Toxin Absorption, Pet Allergens, or Odor Elimination.
  6. Ion Generator: Adds an extra boost of air cleaning power.

Two additional features you’ll enjoy are:

  • It can be wall-mounted.
  • The front panel comes in two different colors and numerous designs. It can blend in as a piece of art in your room.

For large spaces under 1,000 square feet, this is one of the best air purifiers for large rooms available for cleaning the air.

Buy on RabbitAir

2. Alen BreatheSmart Air Purifier

Alen BreatheSmart Air Purifier with True HEPA filters

Next up is an extra large room air purifier that also gives you the flexibility to customize the internal HEPA filter and choose a front panel design that meets your individual needs. It covers up to 1,100 square feet.

This Alen BreatheSmart air purifier gives you a choice between four types of True HEPA filters:

  • HEPA-Pure: Targets microscopic allergens.
  • HEPA-Silver: Includes an extra layer of protection for asthma sufferers.
  • HEPA-FreshPlus: Includes extra layers to attack smoke and heavy chemical vapors.
  • HEPA-OdorCell: Includes extra layers to combat strong odors from pets and babies.

This model also includes an air cleaning boosting ionizer.

As for color choices, the front panel comes in 14 different colors and designs.

You can choose between white, blue, brown, pink, graphite, champagne, brushed bronze, brushed stainless, black, rosewood, natural maple, and more.

Buy on Alen

3. Medify MA-40 Air Purifier

Medify MA-40 Air Purifier with Tempered Glass Panel

What makes this product so good is the 4-Stage Air Cleaning System with one of the highest grade HEPA filters available, and covers up to 840 square feet.

This powerful air purifier tackles pollutants of all types—making the room it’s placed in a much healthier environment.

The 4-stage air cleaning system includes:

  • Pre-filter: For trapping the largest particles and extending the life of the other air filters.
  • Medical Grade H13 HEPA Filter: A higher grade filter than a standard True HEPA filter. It captures 99.95% of microscopic allergens, dust, and mold spores down to 0.1 microns in size. An excellent choice for people who suffer from allergies or asthma.
  • Activated Carbon Filter: Reduces odors and gases caused by pets, smoke, cooking, paint, and new building materials so the room smells fresh.
  • Ionizer: Produces negative ions to improve the efficiency of the internal air filters and revitalizes the air.

While this particular air purifier is made for large rooms up to 840 square feet, there’s also a smaller model available: The Medify MA-25, which is good for spaces up to 500 sq. ft.

Two other things worth pointing out is that this air purifier also comes with a 8-hour Timer and Child Lock.

The timer lets you set the air purifier to automatically turn off after 0-8 hours when don’t need it running all day. And the child lock disables the control panel buttons so that the settings can’t be changed.

It’s also one of the only air purifiers with a Tempered Glass Panel so you never have to worry about it getting scratched like plastic other plastic models.

Buy on Amazon

4. Molekule Air Purifier

Molekule Air Purifier

How would you like an air purifier that actually destroys and not just traps airborne pollutants at a molecular level?

If you want a unit that can eliminate all traces of particles in your home, then you’ll want to consider this air purifier right here.

It’s the only one that uses advanced PECO filtration technology:

  • PECO filtering doesn’t just trap particles on a filter as HEPA air purifiers do. Instead, PECO destroys airborne contaminants at their core so they vanish from existence.
  • PECO nanotechnology destroys allergens, mold, bacteria, and viruses so you have the cleanest, healthiest air to breathe.

As for controlling this air purifier, you have two choices:

  • The touch screen display on the top of the unit allows you to make adjustments to the fan speeds and automatic modes.
  • The Wi-Fi app lets you sync it up with your iPhone or Android device for full wireless control.

You won’t find anything else quite like this unit. And it’s one of the most stylish air purifiers you’ll find today for your home. It covers up to 600 square feet.

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5. IQAir HealthPro Plus Air Purifier

IQAir HealthPro Plus Air Purifier

Covers 1,125 square feet

Perhaps you’re looking for a medical-grade air purifier that can handle an extra large room inside your home or office.

If that’s the case, then the IQAir HealthPro Plus model is the machine you need.

While it’s marketed for people who have severe asthma or allergies, it’s also excellent for anyone who wants the cleanest, freshest air possible in a large space.

The two features that stand out include:

  • Advanced HyperHEPA Filter – Captures 99.95% of particles down to 0.003 microns—the smallest that exists. It also lasts up to four years.
  • V-5 Gas and Odor Filter – Captures toxic gases and odors from volatile organic compounds (VOCs), automobile exhaust, paints, carpeting, furniture, formaldehyde, and carbon monoxide. It lasts up to two years.

If you want the best air purifier for large rooms that has super-long lasting filters, this is the one to buy.

Buy on IQAir

6. AIRMEGA Air Purifier

AIRMEGA Air Purifier with Activated Carbon Filter

Perhaps you want the best air purifier for large spaces that has Wi-Fi capabilities — one that lets you control the unit from your mobile device and get real-time reports and updates about the quality of your indoor air.

If that sounds ideal, then AIRMEGA has everything you need.

This model comes in two versions to cover some of the largest spaces possible:

To cover such a massive amount of space, this air purifier actually combines its internal filters into one Advanced Max2 Filter Set.

  • The True HEPA Filter removes 99.97% of pollutants down to 0.3 microns.
  • The Activated Carbon Filter captures 99% of volatile organic compounds (VOCs) and odor-producing particles.

This air purifier is fantastic for open floor plans, basements, office spaces, and other extra large room indoor areas.

Buy on Amazon

7. Austin Air HealthMate HM400 Air Purifier

Austin Air HealthMate HM400 Air Purifier

Covers 1,500 square feet

Our final recommendation for the best large room air purifier is this classic machine here.

The Austin Air HealthMate HM400 is a simple device that doesn’t have any extra fancy features. You turn it on, choose a speed setting, and enjoy freshly cleaned air.

The thing that makes it stand out from other air purifiers is that it offers 360-degree air filtration.

  • This unit draws air in through every side, not just the front like other brands.
  • This design maximizes airflow and offers less restrictive placement inside a room.

As for the internal air filters, you get a combination filter that includes:

  • True HEPA Filter: Captures 99.97% of contaminants down to 0.3 microns.
  • Activated Carbon Filter: Includes 15 lbs. of activated carbon which is unmatched in the marketplace. This machine is a beast for removing household odors, tobacco smoke, and volatile organic compounds (VOCs).

Best of all, the filter life expectancy is 5 years. So you can enjoy clean, fresh air without having to pay for a replacement for half a decade.

And finally, this extra large room air purifier comes in multiple color options, such as white, black, midnight blue, and sandstone.

Buy on Amazon

How to Choose an Air Purifier for a Large Space

Hopefully, the reviews above helped you find the right air purifier for your needs.

But if you need some additional guidance on how to choose an air purifier, then this section can help.

What’s considered a large space?

When you’re comparing air purifiers, you’ll quickly discover that each one handles a different amount of space.

And if you don’t buy the right size air purifier, you could end up with a unit that’s underpowered for the room you’re using it in.

For the purposes of this air purifier buying guide, the term “large space” is any area of your home or office that’s larger than 500 square feet (sq. ft.)

500 square feet is considered the starting point for a “large” room because most rooms in residential and commercial buildings are smaller than that size.

So when you’re shopping for an air purifier for a large space, you’ll want to look for a unit that can handle at least 500 sq. ft. or larger depending on the actual size of the room (we’ll explain this next).

The most common areas that people use a large room air purifier include:

  • Living rooms
  • Combination living, dining, and kitchen areas (i.e. open floor plan)
  • Basements
  • Open office spaces
  • Rec rooms
  • Garages
  • Workshops
  • Children’s play areas

Larger air purifiers are great devices for keeping the air inside these bigger rooms clean and fresh.

What size air purifier for a large room do you need?

Now that you know what the starting point is for a large air purifier, the next question you may have is, “How do I find the right size for the coverage I need?”

To determine the correct air purifier room size for the unit, you’ll need to figure out the total square footage for the space you’re going to use the air purifier in.

If you’re going to cover just one room, that makes things easy; you only need to find the square footage for that one room.

But if you want to purify several connected rooms (e.g. an open space living and dining room), then you’ll need to measure the square footage for each of the areas separately and add the two totals together.

How do I measure my room?

To measure one large room:

  • Take a tape measure and measure the width and length of the room (in feet).
  • Multiply those two numbers together to get the total square footage.

For example, a 25′ x 30′ room would equal 750 square feet (sq. ft.).

  • 25 x 30 = 750 sq. ft.

If the width or length is an odd number, like 25′ feet 5″ inches, just round the number up. It makes for easier math and won’t affect the total square footage that much when buying an air purifier.

To measure a large space that includes multiple connected rooms, you just need to measure each room separately. Then, add the total square footage for each together.

For example, an open floor plan that has a combination living room (20′ x 25′), dining room (16′ x 16′), and kitchen (15′ x 15′) would equal 1,056 square feet.

  • 20 x 25 = 500 (living room)
  • 16 x 16 = 256 (dining room)
  • 15 x 15 = 300 (kitchen)
  • Total = 1,056 square feet

Now, to find the minimum square footage rating you need for an air purifier to handle your needs, just measure your own room or rooms.

What to Look for in the Best Large Room Air Purifier

Here’s something you need to know upfront: no two air purifiers are the same.

Every manufacturer builds their unit differently and there is no easy answer for what does an air purifier do. That’s because each person wants something different out of the best large room air purifier.

For example, you may want the best air purifier for basement that can get rid of mold spores and damp odors, but someone else might want the best air purifier for cigarette smoke to remove tobacco particles inside a large smoking room.

Those two machines must be built differently to effectively clean the air of those types of particles.

So when you’re deciding on an air purifier, you’ll want to consider a few features to find the best product for your needs.

And those features include:

True HEPA Filter

What do HEPA filters do is collect the widest range of contaminants from the air; however, not all HEPA filters are of the same quality.

When you’re buying an air purifier for a large space, you need to get one that has a “True HEPA” filter. Especially if you’re looking for the best air filter for allergies.

True HEPA filters are the only type that’s certified to capture 99.97% of particles down to 0.3 microns in size. HEPA filters that don’t include the word “True” are inferior products.

In fact, some HEPA filters may only trap particles that are 2 to 5 microns in size which is a 500 to 1,500% reduction in the efficiency.

True HEPA filters can eliminate microscopic pollutants such as:

  • Dust
  • Allergens
  • Pollen
  • Mold spores
  • Visible smoke
  • Some bacteria
  • Pet dander

For anyone with asthma or other respiratory conditions, it’s essential that these types of particles are filtered out of the air. That’s why the best asthma air purifier on the market will always include a True HEPA filter.

It’s also just the smartest choice for a basement where thousands of different microscopic contaminants linger.

Activated Carbon Filter

While True HEPA filters collect the most common indoor contaminants, the fact is they can’t reduce odors, gases, or chemicals floating in the air.

To do that, you need a special type of filter called an Activated Carbon Filter.

This material is specially designed to extract the things that a True HEPA filter misses.

For example, a True HEPA filter can remove visible smoke but not the odor associated with it. That’s where an Activated Carbon Filter comes in; it’s what makes air purifiers help with smells.

The same thing is true for mold. A True HEPA filter can reduce the level of mold spores but not take away the damp smell. An Activated Carbon Filter is needed for an air purifier to help with mold odors.

Activated Carbon Filters are also the only type of filter that can remove Volatile Organic Compounds (VOCs) that invade indoor air. These compounds come from all sorts of things, like paints, cleaning products, furniture, carpeting, building materials, office equipment, etc. And these items can take years to fully off-gas the VOCs which leads to long-term air pollution.

As a recap, Activated Carbon Filters remove contaminants such as:

  • Odors from pets, cooking, mold, smoke, etc.
  • Volatile Organic Compounds (VOCs) from paints, varnishes, furniture, carpeting, building materials, office equipment, toys, adhesives, glues, etc.


Ionizers are an advanced feature that helps to boost the air cleaning power of an air purifier.

The purpose is to knock pollutants out of the air at a faster rate and extend the life of the internal filters.

The science behind how do ionizers work is by emitting negatively charged ions out into the air that latch onto contaminants.

This bond adds extra weight to the particles and causes several things to occur:

  • The pollutants get sucked into the air purifier’s filters quicker.
  • Some of the pollutants fall onto the ground so you don’t breathe them in.
  • Some of the pollutants stick to surrounding surfaces.

An Ionizer is not a must-have feature on an air purifier but it does add an extra layer of protection when filtering large volumes of air in a big room. See our guide on ionizer vs air purifier for more details.

Wi-Fi Capabilities

These days, it’s standard for most large air purifiers to come with a remote control.

However, if you want to control your air purifier with a smartphone or other mobile device then you’ll want to look for the best smart air purifier that includes Wi-Fi capabilities.

A Wi-Fi enabled air purifier is a nice upgrade since it lets you control the unit from anywhere.

As long as you have an Internet connection, you can turn the air purifier on or off from anywhere in the world.

Another benefit of getting a Wi-Fi air purifier for a large room is that many of the apps include real-time air quality reporting and alerts. This feature allows you to get a minute-by-minute update on the air quality level inside your home or office so you know how clean or polluted it is.

There are also air quality monitors available that can work alongside an air purifier that is not smart-enabled. This frees you up to choose the best air purifier for your needs and budget without worrying about the Wi-Fi connectivity. Check out our best air quality monitor list if you want to supplement your air purifier with one of these devices.

Coverage Area

We discussed the topic on how effective are air purifiers in the previous section but it’s worth quickly repeating.

You must get an air purifier that can handle the amount of air space in the room you’re going to use it in. That way, you can enjoy all of the air purifier benefits.

For example, putting a 600 square feet air purifier in a 1,000 square feet room is not going to work very well. The unit is underpowered for the space and won’t clean the air effectively.

For a room that size, you need a device that can cover a minimum of 1,000 square feet.

Common Large Room Air Purifier Questions

What is the Best Large Room Air Purifier?

Best Large Room Air Purifier

Although there are many air purifiers you can buy today, the overall best air purifier for large rooms is the Rabbit Air MinusA2.

This unit has a six-stage air filtration system that removes the widest range of indoor contaminants. You can so customize one of the internal filters to meet your specific room air quality needs.

This large room air purifier is also wall mountable, comes in numerous colors and designs, and offers a Wi-Fi enabled version for wireless control.

Most importantly, the Rabbit Air MinusA2 covers large rooms up to 815 square feet.

All-in-all, it’s the best air purifier for large spaces under 1,000 square feet.

We also recommend this unit on our best office air purifier page and best air purifier for basement reviews due to its advanced user features and ability to handle a large amount of space.

Should I Leave the Air Purifier On All Day?

Air purifiers work the best when they’re left running all day and night. The more time indoor air can get recycled through the internal filters, the cleaner it becomes. If you were to turn off the unit at night or any other time of day, the pollutant levels can start to rise again.

The most trusted air purifier companies suggest that you keep your air purifier running 24 hours per day and 7 days per week.

Many air purifiers include a measurement for the ACH rating and CADR rating and it’s important to run your air purifier continuously to maximize the efficiency of the unit.

ACH stands for “Air Changes Per Hour” and it tells you how many times the air inside a large room is exchanged each hour with the unit. A 4 ACH rating means the air is filtered four times each hour (or every 15 minutes).

The CADR rating meaning indicates the efficiency level of filtering out three specific pollutants: dust, pollen, and tobacco smoke. The higher the CADR numbers, the more efficient the air purifier is at filtering out those pollutants. For example, an air purifier for 1,000 square feet that has a CADR rating of 700/700/700 is better than a unit with 500/500/500.

Can Air Purifiers Be Harmful?

Filter-based air purifiers are not harmful in any way. The reason being is that they don’t produce any by-products during air filtration. So if you’re asking the question, “can an air purifier make you sick?’, the answer is predominantly no.

Some people have reported ionizer air purifier side effects that have caused throat or lung irritation in people with asthma or other breathing sensitivities. (See also is an ionizer bad for asthma.)

If you purchase an air purifier that has an ionizer and experience any tightness of the chest or throat problems, it will be better for you to turn that function off.

However, not everyone has those experiences so don’t let the idea of an ionizer scare you.

If you buy an air purifier that includes an ozone generator, then it can harm your health, no matter if you have an existing health condition or not.

Ozone is a toxic substance that can irritate your eyes, throat, lungs, and skin. So, we recommend that you stay away from these products when buying an air purifier for a large space that people congregate in.

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

You can use a small air purifier in a large room, but the air purifier won’t be very effective and it may cause you to question is an air purifier worth it because you won’t get the maximum efficiency from it.

The fact is that each air purifier is built to handle a maximum amount of space.

If you place a small air purifier in a room that’s too large for it to handle, it will essentially take a longer period of time to fully clean the air.

Many air purifiers are rated to exchange the air inside a room between 4 to 6 times per hour.

So if you place a small 300 square feet air purifier in a 600 square feet room, then that exchange rate is cut in half.

And the bigger the room, the fewer air changes per hour occur.

For large areas, you really want one of the top air purifiers that are built to cover the square footage space.

The internal air filters are designed to filter out pollutants from large volumes of air.

In our air purifier reviews above, we specified the square feet for each unit so you can make sure that you get a large enough air purifier.

Can an Air Purifier Be Too Big for a Room?

Technically speaking, an air purifier can be too big for a room. But this doesn’t mean that it won’t clean the air effectively. You’ll just overpay for the unit and spend more money on filter changes.

Essentially, each manufacturer designs their air purifier to meet a specific room size, so it’s best to use the unit in an area that’s close to that size space. This will allow you to get the most impact from the air cleaner as well as save on the long-term costs of ownership.

For example, an air purifier for 2,000 square feet would be overpowered for a 500 square feet room. That extra 1,500 square feet of power is not necessary for a device in that room.

A better choice would be to get an air purifier for 500 square feet or one that’s designed to purify space slightly large (e.g. 700 square feet). Either of these air cleaners would give you the best trade-off between air filtration efficiency and price.

Where is the Best Place to Put an Air Purifier in a Room?

The best place to put an air purifier in a room is where it will filter out the most contaminants.

Follow these tips to get the most efficiency from the air purifier in any room:

  • Place it near the center of the room: The closer the air purifier is to the room center, the more it can draw air in from every corner and circulate it through the filters.
  • Place it 24 inches from the wall: Most air purifier manuals will instruct you to keep the unit at least two feet from the wall. This position allows the air purifier to have better inward and outward airflow.
  • Place it 3 to 5 feet off the ground: Putting the air purifier on a table or mounting it on the wall will allow the unit to better filter horizontal indoor air movement as well as vertical air movement.
  • Do not place it in a corner: Putting the air purifier in a corner can decrease efficiency by 50% or more. That’s because the air cleaner is not able to effectively pull in room air that’s far away. As mentioned in our first tip, place the air purifier as close to the center of the room as possible.
  • Do not place it behind furniture: Putting the air purifier behind an obstacle will impede airflow. As a general rule, try to give the unit as much space around it as possible. The more space you give it, the easier and quicker it will do its job effectively. 
  • Do not place it in a room with high humidity: High humidity means heavier air and this can decrease the efficiency of the air purifier, especially in large rooms. A large humid room will require the air purifier will reduce the capacity of filters (especially HEPA filters) by making them damp. This will make the unit use more energy and lower the number of pollutants it traps.

Bottom Line

We hope this detailed guide on how to find the best air purifier for large spaces was helpful for you.

As you discovered, it’s very important for you to get the right size air purifier for your needs.

You can’t just place any size air purifier in a room and expect it to work well.

Small air purifiers are made for small rooms, large air purifiers are made for large rooms, and extra large air purifiers are made for extra large rooms.

By choosing any of the best large room air purifiers on this page, you can ensure that you’re getting a high-quality product that will keep the air around you fresh and clean.

Avatar for Patrick Holmes

About Patrick Holmes

Patrick is a Senior Air Quality & Comfort Specialist. He conducts in-depth research and analysis for our product reviews and buying guides in order to offer expert recommendations for people who are seeking to improve their indoor air quality and comfort. (See Full Bio)