What an air purifier does

7 Best Air Purifiers for Large Rooms — Breathe Deeper with No Fear!

  • 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.

Coverage area

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.

Fan speeds/settings

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

7 Best Air Purifiers for Large Rooms — Breathe Deeper with No Fear!

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.

Extra features

7 Best Air Purifiers for Large Rooms — Breathe Deeper with No Fear!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.