Holds a Master’s degree in Engineering and is keen on her own home’s climate. Sometimes we think that Carolina owns every single product she writes about – that’s how profound and insightful her reviews always are.
For 8 years, Richard had been working as an HVAC specialist and AC unit installer since his student years. Now, he’s our main consultant on every technical aspect that may arise during our tests and research.
Last updated: June 28, 2021
Anyone seeking to improve the quality of air around them will benefit from the best air purifier for large rooms. These appliances are equipped with advanced filtration mechanism to remove pollutants and harmful airborne particles from the air. Such a device provides a great, modern solution for making the air around you cleaner and healthier even if the space is large and hard to keep under control.
Before making your final decision, you should consider the coverage area, number, and type of filters, user settings, dimensions and other extra features of your prospective model. The coverage area will help you to identify the right unit for the size of your intended room, and multiple versatile filters will offer you a high level of protection by eliminating diverse types of impurities that invade your home. Variable settings allow you to customize the output to your preference while the dimensions enable you to purchase a product that will easily fit in your available space. Lastly, additional features such as control panels and timers are convenient in enhancing your overall user experience.
To determine the best air purifier for large rooms, we evaluated numerous models on the market and compared their individual features and feedback from verified buyers and authoritative review sites. The following review consists of an outline of the top-rated models, a comparison table, in-depth reviews of each model, and a resourceful buying guide which examines the key features in detail and offers maintenance tips for a durable investment.
More features: 1-12 hour timer; display off button
Not only is our Editor’s Choice the quietest model in this review, but it is also the best large room air purifier which can effectively eliminate mold spores, smoke, odor, pollen, dust and 99.97% of harmful airborne particles as small as 0.3 microns. Additionally, it has been listed by ETL and certified by CARB and FCC for safety and energy efficiency.
The Levoit LV-H133 Air Purifier features a pre-filter, true HEPA filter and high-efficiency activated carbon filter which utilize cyclone technology to filter air drawn from all sides of the unit at a 40% higher volume and airflow rate than other air purifiers on the market. You will need 10 to 12 inches of clearance on all sides for optimal air circulation.
This model is equipped with a brushless motor and an intelligent sensor which displays real-time air quality in a color-coded ring, monitors impurities in the air and automatically selects the most suitable fan speed among the three settings to clean the air in rooms of up to 538 square feet.
You can schedule the interval of operation by setting the timer from 1 to 12 hours and enjoy uninterrupted sleep at night by turning off the LED display and activating Sleep Mode to yield imperceptible sound of 25 decibels.
Customers credit this air purifier for combating cigarette smoke, pollen allergies, and pet odor. We like its low power consumption of 33 watts and the excellent customer care of Levoit. However, a few buyers have reported an initial odd smell.
More features: PlasmaTRUE technology; AeraSafe antimicrobial treatment
AeraMax 300 Large Room Air Purifier is the best large room air purifier for pets and protection from allergies, asthma, and influenza. It employs four stages of filtration using PlasmaTRUE technology and True HEPA filter with Aerasafe antimicrobial treatment and activated carbon filter to rid your room of mold, dust, dust mites, tobacco smoke and 99.97% of harmful airborne particles.
The antimicrobial treatment sterilizes the HEPA filter to prevent the breeding of odor-causing bacteria, mildew, and fungi while the innovative PlasmaTrue technology traps tiny contaminants through ionization.
It also comes with an Aerasmart sensor that keeps track of the quality of your indoor air and selects the right setting from the four fan speeds to clean the air when it detects impurities.
This model is designed for large rooms with coverage of 300 to 600 square feet. It has been certified asthma and allergy friendly by the Asthma and Allergy Foundation of America and energy-efficient by Energy Star.
The manufacturer recommends replacing the carbon filter and the True HEPA filter after three months and after up to 12 months respectively. To reset the filter light for the HEPA or carbon filter which illuminates when the filters are due for replacement, press and hold the filter icon on the display panel for three seconds until it flashes amber light, then select your desired filter and press and hold again for three to five seconds. You will hear a beep before the light turns off. While the filter light and the ionizer light can be turned off, the blue light stays on as long as the unit is operating. This could distract you when you want to sleep.
What makes it stand out?
Effective against allergies, asthma and influenza virus
Warranty: 5-year limited on electronic parts; 1-year limited on internal malfunctions
More features: Eco mode; air quality indicator; timer
Featuring the broadest range of coverage among the products we have recommended in this review is the Coway Airmega 400 Smart Air Purifier which can remove harmful airborne particles in rooms of up to 1,560 square feet while making two air changes per hour.
It comes with five speed settings: Smart, Sleep, Low, Medium, and High. The brightly colored LED ring sensor detects and displays the level of air quality in real time, and then automatically adjusts the fan speed according to the degree of pollution and the lighting conditions. Since it has a noise output of 22 to 52 decibels, you can still operate this unit on high speed without interruption.
Air is drawn from two sides and passed through the washable and permanent micromesh pre-filter to capture large particles like dust, hair, and fur before it is filtered by the Air mega Max2 filter which consists of activated carbon and a True HEPA filter. This filter eliminates pollen and 99.97% of harmful airborne particles measuring 0.3 microns as well as gaseous pollution from volatile organic compounds, making this model the best large room air purifier for wildfire smoke. A filter indicator alerts you when the pre-filter is due for cleaning and when the Air mega Max2 filter needs replacement.
It also features eco-mode and a timer that can schedule air purification at intervals of 1, 2, 4 and 8 hours.
Although buyers find the cost of replacing the filters expensive, they recommend this model as the best large room air purifier for the money.
The Honeywell True HEPA Allergen Remover employs a three-stage filtration system, including Turbo Clean setting, to purify the air in large rooms of up to 465 square feet by neutralizing odors and removing pet dander, pollen, dust, mold and smoke, making this unit the best large room air purifier for mold and allergens that are at least 0.3 microns in size. It optimizes your air quality by using an activated carbon pre-filter and a HEPA filter. The pre-filter should be replaced after every three months while the HEPA filter requires replacement once a year for peak performance.
Additional features include a high CADR rating of 320 for dust, 300 for pollen and 300 for smoke, and an Air Changes per Hour rating of 5x, which means this unit will purify your room every 12 minutes. This is why this bestseller provides the best air purifier for large open rooms where there is constant exposure to contaminants.
Customers particularly like the high volume of airflow and that the air blows out from the top because it allows you to place the unit next to walls without obstructing air circulation. They are also pleased by the light-dimming option which is handy at night and the side handles, which makes it easier to move this air purifier from one room to another. A number of them have complained about the noise level in Turbo mode. But if feel that this information is not sufficient enough in order for you to make up your mind, you are most welcome to read the detailed Honeywell HPA300 review.
More features: sleep mode; filter change alert; CARB, ETL, FCC & CE certified
Our Budget Pick comes with a 7-in-1 filtration system comprising of a pre-filter, True HEPA filter and activated carbon filter attached with nano mineral, cold catalyst filter, photo catalyst filter, and molecular sieve to eliminate odor and pollutants that are 0.1 micron in size. A light flashes to notify you when the filter is due for replacement. To reset it, press and hold the fan and timer button for three seconds.
Airthereal Pure Morning APH260 Purifier is rated highly by buyers who have installed it in their living rooms, bedrooms, offices, restaurants, hotels, and laboratories measuring up to 355 square feet.
The PM2.5 sensor adjusts the speed of the fan to low, medium or high setting in Smart Mode, depending on the quality of your indoor air while the timer automatically turns off the unit after 12 hours of continuous operation. For nighttime, activate Sleep Mode to operate this air purifier on the lowest speed and enjoy a peaceful sleep with little noise of 49 decibels.
Owners who have rated this model the best large room air purifier for cigarette smoke removal like its low pricing, real-time air quality display and its ability to absorb odor in a short time. It also bears certifications by CARB, ETL, FCC and CE.
The 12-hour timer could do with varied intervals for more customizable options.
More features: one-button control; multiple color options
In addition to being one of the best large room air purifiers for wildfire smoke, odor, dust, pollen, pet dander, mold, viruses, and bacteria, Blue Pure 211+ Air Purifier is also among the easiest models to operate, conveniently utilizing one large touchscreen button to adjust speed settings. The two buttons on the side of the unit allow you easy access to the filter.
The unit is certified by Energy Star and Association of Home Appliance Manufacturers (AHAM). It incorporates three steps of filtration: washable fabric pre-filters in multiple color options, activated carbon filter, and a particle filter.
It has three adjustable fan speeds, coverage range of up to 540 square feet, Air Changes per Hour rating of 5x and Clean Air Delivery Rate (CADR) of 350 cubic feet per minute. When operating on the highest setting, it uses 60 watts and produces 56 decibels of sound. The relatively low level of noise is facilitated by a specialized polypropylene filter media which processes larger volumes of air on lower fan speeds. This filter is made of millions of ultra-thin fibers in different layers. It draws air from all sides of the unit and is less dense than a typical filter to minimize clogging and improve airflow. This 360-degree air intake requires clearance on all sides of the purifier to avoid obstructing air circulation.
Buyers praise its prowess in eliminating odor and regard this unit as the best large room air purifier for smoke and pet odor. Its main downside is the lack of an air quality indicator.
Filters type: pre-filter; activated carbon; High Efficiency Filter
Fan speeds: 3
Dimensions: 16.1 x 9.8 x 24 inches
Warranty: 2-year limited
More features: timer; filter change indicator; air quality sensor
This model may have a minimalistic look but it is packed with a variety of useful features which makes it a contender for the best large room air purifier for pets. They include silent mode which generates only 30 decibels of sound, night time mode that automatically dims the digital display to a faint glow, and an integrated smart sensor that monitors and shows real-time readout of the ambient air quality in numeric form and adjusts the fan speed to match the level of pollution.
The Bissell air400 Air Purifier draws the air through the back panel and filters it through a pre-filter, an inch-thick activated carbon filter and a High Efficiency Filter before blowing it out through the top vent. It refreshes air three times per hour to remove dust, pollen, smoke and pet dander in living rooms, kitchens, bedrooms and basements with coverage of 300 to 400 square feet.
The manufacturer recommends replacing the filters after every six months. A filter indicator will remind you when this time comes.
This model is a hit with pet owners who appreciate its powerful yet quiet performance. Several customers who used this air purifier during the California wildfires are also reportedly impressed by its performance.
A minor annoyance but not a deal breaker is the sound the unit makes when you turn it on or off.
Why is it special?
Air quality display
Variable fan speed
Filter change indicator
Silent and Night modes
What are the flaws?
Annoying on/off sound
Things to Consider
This guide focuses on the most important factors to consider before buying the best large room air purifier for cigarette smoke removal, pet odor, dust, and airborne allergens. The FAQ segment discusses the ideal timeframe for filter replacement and whether your purifier should operate at all times.
What an air purifier does
Air purifiers provide us with clean, breathable air and optimize our indoor air quality by removing pollutants which can cause allergies, asthma and other respiratory infections.
They are equipped with highly-absorbent carbon filters which eliminate odor, tobacco smoke, and gaseous pollutants from VOCs.
The best large room air purifier for pets keeps your house clean and reduces the need to vacuum by preventing the accumulation of pet hair and dander, pollen, mold spores and dust on the carpet, drapery, furniture, and other surfaces.
Features to consider while choosing an air purifier
The best large room air purifiers for dust come with ionizers which captures pollutants safely to avoid recontamination of air. The following are a list of other key features you will need to take into account.
The coverage area refers to the size of space that a specific model can effectively rid of airborne impurities without overworking the unit. This is usually indicated by manufacturers in square or cubic footage. For instance, the Airthereal Pure Morning APH260 Purifier has maximum coverage of 355 square feet while the Coway Airmega 400 Smart Air Purifier has very broad coverage of up to 1,560 square feet, which already can be considered as a whole-house air purifier.
To identify the best large room air purifier for dust and other allergens in your intended room, measure your designated room including the height and opt for a product with a higher recommended coverage area than that size to accommodate high level of pollution. This will also enable the purifier to run quietly on low setting while retaining high rate of purification.
Type of filters
Confirm that the type of filter that works with your prospective purifier is designed to eradicate the pollutants in your room because the different filters available on the market vary in their technology and effectiveness against specific pollutants. The best large room air purifier for mold spores, mildew and dust mites has different types of filters to combat a wider range of common contaminants that infiltrate the air around us. All the models we have recommended in this review feature at least three types of filters which include a pre-filter that can be washed or vacuumed and reused to capture debris and large dust particles which could cause clogging and compromise air purification, a HEPA filter that eliminates 99.97% of harmful airborne particles as small as 0.3 microns, and an activated carbon filter that absorbs odor, smoke and other gaseous pollutants. The HEPA filter is considered the ultimate protective filter because it removes almost all airborne particles that are 0.3 microns or larger.
The AeraMax 300 has a four-stage filtration system made of PlasmaTRUE technology, True HEPA filter with Aerasafe antimicrobial treatment and activated carbon filter which trap microscopic microbes through ionization and prevent breeding of odor-causing bacteria, mildew and fungi. The Airthereal Pure Morning APH260 sports a 7-in-1 filter comprising of a pre-filter, True HEPA filter and activated carbon filter attached with nano mineral, cold catalyst filter, photo catalyst filter and molecular sieve to eliminate a diverse range of airborne particles of 0.1 micron in size. Usually, the top HEPA filters will be encountered in the best air purifiers for asthma alleviation or in the units fighting allergies.
Variable fan speed is convenient in customizing the volume and speed of airflow according to the degree of air quality. Operating an air purifier on low speed also saves energy and reduces the noise produced. The Coway Airmega 400 Smart Air Purifier comes with Smart, Sleep, Low, Medium and High speed options and produces 22 to 52 decibels of sound, depending on the selected speed setting.
Some products feature variable modes which offer you more control over the airflow output. Such modes include Auto mode for automatic adjustment of speed based on air quality, Turbo mode for faster purification, Sleep mode for quiet operation with a dimmed display, and Eco mode to preserve energy.
If there’s an air quality indicator
This is an automatic sensor which displays real-time information on the air quality in your room and constantly monitors its purity to check for pollution and adjust the speed of the fan based on the purification needs. Majority of the best air purifiers for large open rooms such as the Bissell air400 come with this function.
It saves energy by letting you schedule the unit to start operating at a specified time. Models differ in their timed intervals. For instance, the Coway Airmega 400 has a programmable timer with intervals of 1, 2, 4 and 8 hours whereas the Airthereal APH260 and the Honeywell HPA300 have a 12-hour auto shut-off timer to save energy when optimal air purification is achieved.
Filter change alert
These are performance and maintenance notifications for filter change. A light flash on the digital panel will remind you when the filter is due for cleaning or replacement.
Knowing the dimensions of your potential purifier will enable you to compare its size to the space available for set up and storage and the ease of portability from one room to another. Products tailored for very large rooms or whole houses tend to be bigger in size due to their powerful motors and large fans which process massive volumes of air, but some of the plug-in air purifiers also can cover larger spaces.
Some units like the Levoit LV-H133 which measures 26 x 16 x 15.5 inches are designed in space-saving cylindrical or tower shapes to reduce their footprint. But their are other Levoit air purifiers which also feature great performance combined with space-saving dimensions.
Air purifiers have a warranty period of one to five years, depending on the model. From our list, the Blue Pure 211+ Air Purifier offers the shortest warranty of one year while both the Honeywell HPA300 and the Coway Airmega 400 come with a limited warranty of five years.
Some manufacturers extend the warranty if you register the product. Research customer feedback online and check authoritative review sites to gain insight into the warranty terms, availability of spare parts, and after-sale service.
Control panel: A user-friendly panel makes it easy to operate the purifier by offering greater precision when adjusting settings. Most models in our list also feature a digital display which shows the current settings in operation and feedback on maintenance alerts and air quality.
Ionizers: Products such as the AeraMax 300 which has ionizers release negatively charged ions into the air that attach themselves to positively-charged 0.01-micron sized airborne particles through an electromagnetic reaction to trap the particles and prevent them from escaping back into the atmosphere. The resultant heavy weight after bonding causes the particles to fall to the ground.
Color options available: The washable pre-filters for the Blue Pure 211+ Air Purifier are available in Diva Blue and multiple Dark Shadow color options to complement and blend in with more décor and appliances.
Night mode: A well-lit display can be disruptive at night if it cannot be dimmed or turned off. The best large room air purifier for pets come with Night Mode function which dims or turns off the display and switches the fan speed to the lowest setting for to minimize noise.
Certifications: One way you can choose the best large room air purifier for the money is by checking for certifications issued by authorized industry bodies to ensure quality control, safety, and energy efficiency. One example of the best large room air purifier for pets that has certified credentials is the AeraMax 300 which has been certified asthma and allergy friendly by the Asthma and Allergy Foundation of America and energy-efficient by Energy Star.
How to maintain an air purifier
Change or clean the filters regularly.
Leave sufficient clearance around the purifier to avoid limiting airflow.
Close the windows when the air purifier is running to avoid overwhelming it with a constant influx of external pollutants.
Whenever possible, consider operating the fan in Eco mode or low speed setting to preserve energy.
Vacuum regularly to reduce the amount of airborne particles in your room.
To get the best large room air purifier for smoke and cigarette smell, you should look for a unit with an activated carbon filter which absorbs and eliminates smoke, odor, and other gaseous pollutants. All the products we have featured come with carbon filters.
Ideally, air purifiers should operate 24/7 to provide consistent protection against pollutants that are constantly lurking in the air. To preserve energy while running for extended periods, most models feature auto mode function and smart sensors which switch to lower speed or eco-mode when there are few or no contaminants in the air. You can also schedule the unit to operate at a specified time by using a programmable timer.
How often you will need to change the filter will vary from one model to another, which is why manufacturers recommend the timeframe for replacing filters designed for their specific products. Most purifiers also have filter change indicators to remind you when the filters are due for cleaning or replacement. Other factors that influence filter longevity are the amount of use and the quality of air.
The Levoit LV-H133 features a brushless motor and 360-degree air intake with cyclone technology which surges it ahead of its peers by delivering 40% more output in volume and speed of airflow while remaining virtually silent on a low setting. It also comes with an automated air quality indicator and a display which you can conveniently turn off at night to avoid disruptive sleep.
The best large room air purifier for mold, influenza, allergies, and asthma is, undoubtedly, the AeraMax 300 which incorporates a four-stage filtration system, including sterilizing antimicrobial treatment and has been certified asthma and allergy friendly by the Asthma and Allergy Foundation of America.
The Coway Airmega 400 boasts of expansive coverage of 1,560 square feet, five variable speed settings, a programmable timer with intervals of 1, 2, 4 and 8 hours, and a remarkable price-performance ratio to make the best large room air purifier for the money.