Photo of a Large RoomDo you have a large room in your house, office, or workshop 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, this free guide is for you.

Below, 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 device 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 a high-quality air purifier for large spaces.

Use these links below to jump to a specific section of the page:

In a hurry? Here’s a glimpse of the two best products you can get.

If you’ve got a bit more time you can find the detailed reviews and buying guide below.

What’s Consider 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 guide, the term “large space” is any area of your home or office that’s larger than 500 square feet (sq. ft.)

500 sq. ft. 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 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 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.

Here’s How to Take Those Two Types of Measurements

How 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.

  • 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.

How to Measure a Large Space (i.e. Connected Rooms)

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 sq. ft.

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 a Large Room Air Purifier

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

Every manufacturer builds their unit differently.

That’s because each person wants something different out of the best large room air purifier.

For example, you may want an air purifier for a basement that can get rid of mold spores and damp odors, but someone else might want a unit that can extract tobacco smoke 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

A HEPA filter collects 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.

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

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.

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 to remove 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 way an Ionizer function works 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.

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 one 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.

Coverage Area

We discussed this 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.

For example, putting a 600 sq. ft. air purifier in a 1,000 sq. ft. 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 sq. ft.

The Best Air Purifiers for Large Spaces

Now that you’re fully equipped with the knowledge on how to choose the right air purifier for your needs, we can move onto the list of the best air purifier for large spaces.

Below, you’ll find the top products for purifying the air in large areas.

We’ve started with the unit with the lowest square footage coverage and worked our way up. 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.

Photo of Rabbit Air MinusA21) Rabbit Air MinusA2 Air Purifier

Covers 700 to 815 sq. ft.

If you have a room that’s not too overly large, then this Rabbit Air MinusA2 air purifier is a great option.

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

Both models also come in a standard version (with remote control) or a Wi-Fi enabled version (with a mobile app).

What makes this a great buy is that it offers unmatched air cleaning performance. It strips practically ever harmful particle from the air.

If you have allergies, asthma, or other sensitivities, it can reduce the contaminants that irritate you the most. It’s 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 rooms under 1,000 square feet, this is one of the best air purifiers you can buy for cleaning the air.

See Reviews

Photo of Alen BreatheSmart2) Alen BreatheSmart Air Purifier

Covers 1,100 sq. ft.

Next up is a 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.

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.

See Reviews

Photo of IQAir HealthPro Plus3) IQAir HealthPro Plus

Covers 1,125 sq. ft.

Perhaps you’re looking for a medical-grade air purifier that can handle a large space 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 exist. 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 a high-quality air purifier that has super-long lasting filters, this is the one to buy.

See Reviews

Photo of AIRMEGA 300S4) AIRMEGA Air Purifier

Covers 1,256 to 1,560 sq. ft.

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 ger 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 large indoor areas.

See Reviews

Photo of Austin Air Healthmate 4005) Austin Air HealthMate HM 400

Covers 1,500 sq. ft.

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

The Austin Air HealthMate HM 400 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.

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.

See Reviews

Common Large Room Air Purifier Questions

Should I Leave the Air Purifier On All Day?

Yes. 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.

So, we suggest that you keep your air purifier running 24 hours per day and 7 days per week.

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.

Some people have reported that the ionizing function on an air purifier has cause throat or lung irritation in people with asthma or other breathing sensitivities. If you purchase an air purifier that has an ionizer ane experience any tightness of the chest or throat problems, it will be better for you to turn that function off.

Not everyone has those experiences, however, 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 Space?

You can, but the air purifier won’t be very effective. 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 sq. ft. air purifier in a 600 sq. ft. 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 an air purifier that’s built to cover the square footage space. The internal air filters are designed to filter out pollutants from large volumes of air.

Enjoy Your New Air Purifier

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 and large air purifiers are made for large rooms.

By choosing any of the 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.