Best Air Purifier For Large Rooms – Detailed & Unbiased Reviews

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Do you have a large room at home that is in desperate need of air purification? It may be your large living room where you entertain guests or your bedroom where you want to enjoy clean fresh air while you sleep. Whatever it is, you will need an air purifier that can actually be effective in such a large space.

When choosing an air purifier for a large room, homeowners typically just look at the coverage area specified by the manufacturers and make their decision based on that. However, there are many other factors which should be considered so that you can maximize your money for the most effective unit. 

Don’t worry if it is starting to sound complicated. We have done the research so that you can make your decision with clearer and updated information. The results can be seen below in our product review guide. 

Below, you will find a list of 5 best air purifiers from reputable international brands, all geared towards large rooms, each with their pros and cons clearly stated.

Coverage AreaWarrantyFilter replacement
Alen BreatheSmart FLEX700 sq. ft.Lifetime9 to 12 monthsHeavy
Bissell Air3201000 sq. ft.5 years6 to 8 monthsHeavy
Levoit LV-Pur131S Air Purifier360 sq. ft.2 years6 to 8 monthsLight
Hathaspace Smart Air Purifier350 sq. ft.2 years4 monthsModerate
Winix 5500-2 Air Purifier360 sq. ft.1 year12 monthsModerate
Best Air Purifier For Large Rooms

You’ll also find a buyers’ guide where you can read our rationale when deciding how to rate these products, and hopefully you can use it yourself when making future purchases.

In a Hurry? This Is Our Winner!

Alen BreatheSmart FLEX Air Purifier

Best Overall Air Purifier For Large Rooms

Product Overview

  • Dimensions: 19” x 16” x 28”
  • Weight: 23 lbs
  • Coverage area: 700 sq. ft. (65 sqm)
  • Clean air delivery rate (CADR): 203㎥ / hr
  • HEPA Filter/Carbon filter replacement frequency: every 9 to 12 months
  • Warranty: Lifetime (with some reasonable terms and conditions)

The Alen BreatheSmart FLEX air purifier is designed for extra-large spaces and can purify the air effectively in a room of about 700 sq.ft. Instead of a normal true HEPA filter, this air purifier uses a H13 true HEPA filter which is medical grade. With this filter, the unit is able to remove 99.99% of bacteria, aerosolized viruses and airborne particles larger than 0.1 micron. In today’s world, this ability to capture bacteria and viruses is a very important feature to have. Besides these, it goes without saying that common pollutants like dust, pet dander, fur, mold would also be captured by the filter. The presence of an activated carbon filter will then take care of any odors in the room.

In terms of functionalities, this air purifier comes with 4 fan speeds from Low to Turbo. At the lowest fan speed, the noise level registered is about 39 dB which is usually still bearable by most people standards. At this setting, it can be a good choice in extra large bedrooms, living rooms, offices and basements. If the need arises and you need to switch to Turbo, the noise does get a little high at 55 dB. However, something unique that this air purifier does at the Turbo setting is that it also emits a frequency called pink noise which is similar to white noise and will aid in sleeping. A nice touch but 55 dB may still be disruptive for some sensitive sleepers.

Other features include a Sleep mode that has a “lights out mode” that turns off all the light. For users who are really sensitive to light while they sleep, this is pretty useful. The filters are also very durable and last longer than normal HEPA filters. The H13 HEPA filters in this air purifier can last between 9 to 12 months before it requires replacement and ensures that homeowners do not spend a fortune on filter maintenance. Regarding filter maintenance, homeowners would also appreciate how easy it is to clean the filter. The front can be easily removed and the filter can be vacuumed without a mess!

What really impressed me though is the lifetime warranty that comes with this air purifier. This is totally unheard of in this industry and it just goes to show how confident Alen is in their products. There are of course some terms and conditions to adhere to for this warranty to be valid but they are totally reasonable. Who says only diamonds last a lifetime?

In summary, a great air purifier that will really do the heavy lifting for you. The price may sound intimidating but there is always a price for true quality. 


  • H13 HEPA filter is extra durable and filters more pollutants
  • Good for extra-large rooms
  • Annual replacement of filters
  • Easy to clean the filters
  • Lifetime warranty


  • Can be noisy on Turbo fan setting
  • Heavy and not portable

What the fans love: “Air quality is very important, and this air purifier made all the difference in our home. They’re haven’t been any emergency room visits since using this and that says a lot in my life! I can breathe easier, the air quality is so good I mean every time someone comes over they say what a huge difference the smell of fresh air it is.”

Best Air Purifier For Large Rooms Buyers’ Guide

Why An Air Purifier Is Important For The Home

The adverse health effects of indoor air pollution are well established and well researched. Many studies have demonstrated a clear relationship between air pollution and respiratory disorders. A research article recently found a strong association between respiratory symptoms and indoor air pollution. This is especially so if the individual is exposed to the air pollution for a prolonged period of time. 

Common symptoms of poor air quality that may show in us are 

  • Breathlessness
  • Cough that does not recover with medication
  • Wheezing
  • Asthma attacks
  • Respiratory infections

If you or someone in your family are having these symptoms, it may be time to invest in a good air purifier. 

Sources Of Indoor Air Pollution

There are many sources of indoor air pollutants and pollutant concentration can remain in the air for long periods once it is emitted. Some common sources of indoor air pollutants are:

  • Tobacco products
  • Deteriorating asbestos-containing insulation
  • Furniture made of certain pressed wood products
  • Household cleaning products 
  • Excess moisture
  • Outdoor radon
  • Pesticides
  • Traffic pollution

Considerations When Choosing An Affordable Air Purifier 

Coverage Area

When choosing your air purifier, you need to find out the size of your room as accurately as possible to avoid disappointment. The easiest way to find out the size of your room is to measure the length and breadth of your room and then multiply them together.

Once you have an idea of the actual size of your room, you can look at the models of air purifier that you are interested in. Almost all manufacturers will list down the coverage area of their humidifiers in the product overview. These give you a good indication of what size room the air purifier is best for. 

When looking at these values provided by the manufacturers, I would probably round them down by about 20%. For example, the manufacturer may say that the air purifier can cover an area of 500 sq. ft. but I would take away 20% from that and estimate the coverage area to be about 400 sq. ft. This is because these values were probably measured in an ideal environment where there are no leaks or drafts in the room. In real life, we may have leaky windows, wall cracks, door gaps that may contribute to the reduced air quality.

For home appliances geared towards large rooms, do check out our other guides below!

Best Humidifier For Large Rooms

Best Space Heaters For Large Rooms

Best Space Heaters For High Ceilings


Air purifiers can come in a few different designs. The common models are compact, tower and wall mounted. Each design would have its pros and cons and suitability in different situations. Depending on your needs and requirements, this may or may not be an important point. For those on a budget, getting a portable unit would be wiser as it can be transported between rooms and homeowners do not need to get multiple units. However, if you need to purify the air in a large room, you will definitely need a larger air purifier with a larger filter. In these cases, the air purifiers are heavier and it would make more sense to leave it in one location.

Replacement Filter Maintenance

When choosing an affordable air purifier, it is important to look beyond the immediate buying price. Homeowners need to consider the long term cost of owning an air purifier by looking at the frequency of filter replacement and also the cost of filter replacement. Generally, filters need to be replaced every 6 monthly but this may differ based on the air quality in your area.  

Homeowners should also consider getting models whereby the replacement filters are affordably and reasonably priced. Be wary of models where the replacement filter cost a fortune as these will add up really fast over the years. In the long run, choosing an air purifier with low maintenance cost will save you a lot of money.

Presence Of True HEPA Filter 

While HEPA filters cannot do anything against gaseous compounds, they work wonders against solid airborne particles. It is worth noting that some solid airborne particles may also emit smells and odors. Examples of these are mold spores and tobacco soot. With a true HEPA filter, your air purifier will be able to remove these from the air and improve the air quality significantly while also removing the odor from these pollutants.


For any electrical appliances, the length of warranty is always something to consider. Obviously the longer the warranty, the better it is for the consumer. A long warranty is also suggestive that the company is very confident of their product’s longevity and durability. Generally in the air purifier sector, a warranty period of 1 to 2 years is quite reasonable and anything beyond that is considered good.

considerations for choosing air purifier

How Does An Air Purifier Work

Air purifiers work by moving air through filters that clean the air and then recirculating the “cleaned” air back into the room. The key to their effectiveness lies in these filters. Most air purifiers now contain multiple filters that are responsible for cleaning different components of the air it sucks in.

HEPA filters

HEPA (high efficiency particulate air) filters are the cornerstone of all air purifiers on the market now. It is a filter that is usually made of fibreglass in a maze-like tangle of fibres. To satisfy HEPA requirements, a candidate filter must remove 99.97% of particles of diameter 0.3 μm, with even greater filtering efficiency for larger and smaller particles.

HEPA filters require regular replacement and filters can last between 6 months to a year before it needs a replacement. When purchasing an air purifier, it is worth considering how frequently the filter needs replacing and the cost of a replacement filter to get a feel of the true cost of your air purifier.

True HEPA Filters

Activated Carbon Filter

This is an adsorbent type filter that is made from processed carbon. The carbon is processed into an extremely porous form to increase surface area for absorption. The main objective of this filter is to capture volatile organic compounds and gaseous compounds. Unlike a HEPA filter, activated carbon filters cannot trap particles like dust and pollen. However, it can capture and remove odors and gaseous chemicals that HEPA filters are weak at.  Therefore, activated carbon filters usually act as a pre-filter to a HEPA filter.

 An activated carbon filter also requires replacement when it becomes saturated. Buyers also need to check in with the manufacturers regarding the replacement frequency and how expensive a replacement is.

Activated Carbon Filters

UV Light filter

Some air purifiers contain an ultraviolet light filter that is advertised to be able to kill bacteria and viruses. It achieves this by using UV rays to break down the chemical bond between virus DNA and hence rendering them inactive. The biological principles are sound but critics are not convinced that a UV light filter is really effective in killing viruses. Their argument is that air passess too fast through the light for the UV rays to have any effects. For now, the jury is still out so buyers do have to weigh the additional costs against the potential benefits and see if it is worth it for them.

Another criticism of UV light filters is that it may produce ozone. Ozone is a by-product from the breakdown of oxygen and can cause a variety of respiratory symptoms in humans. However, numerous testing have shown that the amount of ozone produced, if any, is extremely low and falls well within the safe range of human exposure.

UV light filters are not replacements for HEPA filters but act as an adjunct to them. UV light filters do not require replacement unless the light bulbs blow.

Negative Ion Filter

These filters may also sometimes be known as ionic filters. They work by producing negatively charged ions that can attach themselves to particles floating around in the air. The ionized particles then settle on surfaces which allows for them to be wiped away. The main advantage of these filters is that they are extremely quiet as they do not require a fan.

These filters were very popular in the 1990s and early 2000s. However, they are now displaced by HEPA filters. Part of the reason is because ionic filters may produce ozone that can cause respiratory problems in humans. However, numerous testing have shown that the amount of ozone produced, if any, is extremely low and falls well within the safe range of human exposure.

Ionic filters do not need replacements as air do not pass through them and they will not get clogged up.

Best Air Purifier For Large Rooms Product review

Bissell Air320 Smart Air Purifier

Best Air Purifier For Extra Large Rooms

Product Overview

  • Dimensions: 8.3” x 14.75” x 25”
  • Weight: 18.25 lbs
  • Coverage area: 1000 sq. ft. (92 sqm)
  • Clean air delivery rate (CADR): 180㎥ / hr
  • HEPA Filter/Carbon filter replacement frequency: every 6 to 8 months
  • Warranty: 5 years

The Bissell Air320 air purifier is designed for extra-large spaces and can purify the air effectively in a room of about 1000 sq.ft. This makes it a perfect choice for those with large living rooms, large bedrooms, large basements or even your garage. Instead of getting multiple air purifiers for these really large spaces, you can make do with just one of these. In the long run, you will save money on lesser replacement filters and also less effort required for regular cleaning and maintenance

Featuring a three-stage filtration system of a pre-filter, HEPA filter and an activated carbon filter, this air purifier adopts a no frills approach to air purification. With these 3 filters, it is able to remove pollen, smoke, odor, pet dander and particles as small as 0.3 microns.During maintenance, the filters are also easily accessible from the front and homeowners can easily access them for cleaning and vacuuming. With this design, this purifier can be placed against the wall and out of the way.

Other features include an Auto mode and a Sleep mode. The Auto mode will monitor and provide real-time indoor air quality readings and make adjustments to the fan speeds accordingly. For users big on convenience, this is a great feature. In Sleep mode, the fan speed will lower automatically so that there is less noise and there is also auto dimming of the lights to help those sensitive to light during bedtime.

One limitation of this purifier is perhaps the weight of it. Weighing almost 20 pounds, it is not exactly portable and homeowners will likely find it a hassle to move it between rooms. Thankfully, because of its high coverage area, you do not need to move it around much anyway. 


  • Functional 3 stage filtration system
  • Good for extra-large rooms
  • Easy to clean the filters
  • Long warranty period
  • Auto mode for convenient fan adjustment


  • Heavy and not portable

What the fans love: “Amazing build and very beautiful minimal design, very easy to control with just one button and has an excellent air purifying quality, I cannot recommend this enough, it’s built very well, and feels premium, it’s perfect for specially people with allergies.”

Levoit Smart WiFi Air Purifier LV-PUR131S

Best Large Room Air Purifier With Remote Control

Product Overview

  • Dimensions: 14.6” x 7.2” x 18.5”
  • Weight: 11.5 lbs
  • Coverage area: 360 sq. ft. (33sqm)
  • Clean air delivery rate (CADR): 230㎥ / hr
  • HEPA Filter/Carbon filter replacement frequency: every 6 to 8 months
  • Warranty: 2 years 

Designed for a large room, the Levoit Smart Wi-Fi air purifier can effectively purify the air in a room up to 360 sq. ft. This is the size of a good living room in most of our homes and it is definitely more than enough for bedrooms, nurseries and other rooms in the house. The 3 stage filtration system consists of a pre-filter, HEPA filter and activated carbon filter. Compared to other models on the market, this may seem less fancy but you can rest assured this works and will remove 99.97% of any air pollutants and odors in your home. Because there is no UV light or ionizer, there is also zero risk of ozone being produced.

The most defining feature of this air purifier is how easy it can be controlled remotely. For the elderly and seniors with mobility issues, this is a lifesaver and allows the user to control and adjust the settings from anywhere in the house. Instead of a conventional remote control, this air purifier works with Alexa and Google Home Assistant so users can just give a smile voice command to control the air purifier. If you are not keen on using voice control, the air purifier can also be controlled with the smart phone anytime and anywhere. 

The app also allows other advanced features such as direct control, scheduling purifying sessions, air quality display, cleaning modes and filter life. As you can tell, this air purifier just screams user-friendliness. One particular feature that I find really helpful is the air quality monitor. The advanced dust sensor will detect particles in the air and keep the user updated on the air quality on the app. There is no need to second guess if you suspect the air is poor. Just check the app and you have your answer.

Besides these smart features, one can also make use of the Auto mode which will adjust the fan speed based on the surrounding air quality to ensure the cleanest air with the lowest energy consumption. All these without any effort from the user itself. Totally noob friendly! If using this purifier in the bedroom, there is a sleep mode that will run almost silently at 27 dB so as not to disturb the sleep of our seniors. 

One thing that I wish can be changed is the portability of this unit. Weighing just over 11 pounds, it is not the most compact or portable unit on the market. For our seniors who may be physically weaker, this may prove a challenge to transport around the house. Thankfully, it has a large effective coverage area so our seniors can place it in a strategic spot and it should purify the room well enough.


  • Effective filtration system
  • Can be voice controlled
  • Can be controlled via smartphone
  • Air quality sensor
  • User-friendly
  • Auto mode reduces need to constant monitoring


  • Somewhat on the heavier and bulkier side

What the fans love: “This is one of the best purchases that I have ever made as a homeowner. I highly recommend it and wish I could give it more than 5 stars. I’m asthmatic and have bad seasonal allergies. Using this purifier, I feel like I’m breathing better. If you’re on the fence about buying this purifier, go for it. You’ll be happy that you did. It’s worth every last penny of the price tag.”

Hathaspace Smart True HEPA Air Purifier

Best Quiet Air Purifier For Large Rooms

Product Overview

  • Dimensions: 13.5” x 7” x 19.5”
  • Weight: 12 lbs
  • Coverage area: 350 sq. ft. (32sqm)
  • Clean air delivery rate (CADR): 160㎥ / hr
  • Filter replacement frequency: Once every 4 months
  • Warranty: 2 year

The Hathaspace Smart air purifier is designed for large rooms and can purify air in areas up to 350 sq. ft. Featuring a 5 in 1 filtration system that includes a true HEPA filter and an activated carbon filter, homeowners will not have to worry about fine air pollutants and odors from infiltrating their homes and causing allergies to their family members. The other 3 parts to their filtration system include a cold filter for large particles, an antibacterial filter and an ionizer for smaller particles. 

In terms of customization, this air purifier comes with an AUTO mode that is designed for convenience and efficiency. When using the AUTO mode, this unit is able to adjust its fan speed automatically based on the real-time air quality. This is made possible by a smart air quality sensor that detects and displays the indoor air quality in real time. For users that like that just want the job done without too much overthinking, this is a lifesaver.

For homeowners who plan to use it through the night, you will greatly appreciate the Sleep mode that keeps noise levels as low as 20 dB when it is activated. The lights also turn off automatically during this mode, giving you the most restful and uninterrupted sleep

In terms of convenience, this air purifier comes with a remote control that allows the user to enjoy the flexibility of controlling the air purifier remotely. Homeowners can adjust their preferred settings from their bedside or couch without any issues.

The limitations of this unit include a short cord length of only 3 feet and hence you may need an extension cord to position this air purifier properly. Also, the sleep mode only allows the lowest fan speed which may not be suitable for all users as some would prefer a higher fan speed to clean the air better during their sleep. 

All in all, this air purifier has all the functions and does a fine job at purifying air. There are some minor inconveniences associated with this air purifier but they are definitely not dealbreakers and can be managed easily.


  • Comprehensive filtration system for pet fur, pet dander and pet odor
  • Remote control enabled
  • Quiet
  • Auto mode helps to regulate air automatically
  • Inbuilt air sensor


  • Short electrical cord
  • Sleep mode can only run at lowest fan setting

What the fans love: “If you are a dog person like me, then you know your house can start to develop that doggy smell that may not be as noticeable to you as it is to your guests. The 6 layer purifier is perfect for removing pet and other odors, plus captures their hair in the process. Two large openings allow air to pour in through the filter, and also let my dog hair in, both thick and thin. When you pull the filter out you can tell it does its job.”

Winix 5500-2 Air Purifier

Best Budget Air Purifier For Large Rooms

Product Overview

  • Dimensions: 15” x 8.2” x 23.6”
  • Weight: 15.4 lbs
  • Coverage area: 360 sq. ft. (33sqm)
  • Clean air delivery rate (CADR): 360㎥ / hr
  • HEPA Filter/Carbon filter replacement frequency: once every 12 months
  • Warranty: 1 year

The Winix 5500-2 air purifier is a unit designed for larger rooms that can go up to 360 sq.m in size. It comes armed with a 4 stage filtration system that includes a washable pre-filter, a washable activated carbon filter, a true HEPA filter and the latest PlasmaWave technology. The pre-filter will be the first line of defence against the larger airborne particles, while the odors and finer particles will be managed by the HEPA and carbon filter. Lastly, the PlasmaWave filter acts to neutralize bacteria and viruses. For asthmatic homeowners struggling with allergies at home, this purifier got you covered and you can be assured of fresh clean air at home.

In terms of customization, this air purifier comes with an AUTO mode that is designed for convenience and efficiency. When using the AUTO mode, this unit is able to adjust its fan speed automatically based on the real-time air quality. This is made possible by a smart air quality sensor that detects and displays the indoor air quality in real time. This is a very useful feature for users that like that just want the job done without too much overthinking

Besides the air quality sensor, there is also an odor sensor and a light sensor. During Auto mode, the odor sensor detects the amount of odor in the environment to adjust fan speeds. The light sensor detects the amount of ambient light within the environment to adjust the brightness of the LED indicators.

Another mode that deserves a mention is the Sleep mode that is activated automatically when the room is darkened. The sleep mode ensures a quiet and energy efficient operation through the night that doesn’t disturb the user. During Sleep mode, the noise level is about 28 dB. Once the light is turned on again, the purifier will return back to Auto mode. For seniors with mobility issues, you will also appreciate the remote control that allows easy and convenient adjustment from the comfort of your couch.

There are 2 limitations to this air purifier. Firstly, there is no way to override the auto sleep mode. Therefore, if your house is fitted with dim lighting, this purifier will just be functioning at the low setting as it is in “sleep mode”. Secondly, the filter replacement is one of the most costly ones on the market. Thankfully, the replacement frequency is only once a year but these do add up if you intend to use the air purifier for a long time.

In summary, this is an air purifier loaded with features which can be really useful if you know how to make use of them. It is a little on the pricier side but it justifies the price tag with its quality. 


  • Comprehensive filtration system
  • Auto mode for convenience
  • Sleep mode with dimmed lights and quiet fan
  • Remote control enabled
  • Real time air quality sensors


  • Unable to override the automatic sleep mode
  • Expensive filter replacement

What the fans love: “This machine is amazing! In about an hour all smoke odor was gone and so far when set on “auto” it has kept the air fresh. The fan on the low setting is so quiet you have to hold your hand over the exhaust to see if it is running, even on the “high” setting it is quiet enough for a normal conversation. It is not overly large and being only about 7-8″ deep it fits against a wall making it less noticeable. The front access panel is held in place with magnets so it opens very easily making cleaning or changing filters a breeze”

Frequently Asked Questions (FAQs)

Q: Where is the best place to put an air purifier?

A: Long story short.

  • Close to the odor source
  • Bedrooms and areas with high human traffic
  • On the floor if your main problem is pet fur and dust on the floor
  • Elevated if you are dealing with smoke and soot
  • 8 inches away from walls and furniture
  • 12 inches away from electronics

If you like the full story, check out our guide on the best practices when positioning your air purifier!

Q: Should we shut the windows and doors when using an air purifier?

A: Almost all air purifier companies we interviewed recommend that windows and doors be closed while running the air purifier This improves both air cleaning efficiency and also energy efficiency giving the user better air quality and improved savings. In the case of cigarette smoke, homeowners are advised to open the windows and ventilate the room first. Once the majority of the smoke has left the room, then shut the windows to allow the air purifier to clean the remaining airborne chemicals.

Q: Does air purifier make air dry?

A: No. Air purifiers are unable to remove moisture from the air at all. Therefore it cannot dry up the air. Watch out for other possible reasons that might dry out the air such as a strong fan nearby. If low humidity is an issue, consider getting a humidifier.

Q: Which is better for asthma? Humidifier or air purifier?

A: Both will help asthma but in different ways. Humidifiers help to keep the indoor air moist so that the inhaled air does not dry up the nasal passages and irritate it. Air purifiers clean the air of airborne pollutants which can trigger asthma attacks. A combination unit might be the way forward if your home is suffering from both low humidity and poor air quality.

Recap Of The Best Air Purifier For Large Rooms

Coverage AreaWarrantyFilter replacement
Alen BreatheSmart FLEX700 sq. ft.Lifetime9 to 12 monthsHeavy
Bissell Air3201000 sq. ft.5 years6 to 8 monthsHeavy
Levoit LV-Pur131S Air Purifier360 sq. ft.2 years6 to 8 monthsLight
Hathaspace Smart Air Purifier350 sq. ft.2 years4 monthsModerate
Winix 5500-2 Air Purifier360 sq. ft.1 year12 monthsModerate
Best Air Purifier For Large Rooms

Wrapping it up

Of the 5 products we reviewed, the Alen BreatheSmart FLEX Air Purifier was our favorite because we find that this air purifier has the best balance in terms of purification efficiency, safety, quietness and pricing. There are tons of awesome features that really make this air purifier shine. For homeowners looking to protect yourselves and your family from the harmful effects of indoor air pollution, this air purifier will get the job done. Although priced slightly higher than other models, the Alen BreatheSmart FLEX is a real steal for what it can do!

Click here to get one now!

Related Posts

Best Air Purifier For Seniors And Elderly

Best Affordable Air Purifier

Best Air Purifier For Allergies

Best Quiet Air Purifier

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