Ultimate Guide to the 7 Best Air Purifiers for Large Rooms

Written By: Dr Fahad Yasin

In an age of escalating pollution, the indoor environment often gets overlooked. Yet, as spaces become increasingly sealed off, indoor air pollutants tend to accumulate.

Here, air purifiers serve as vital instruments, cleaning up stale air and reducing health risks from indoor pollution. Before diving into our list of top contenders for large rooms, let’s keep in mind: size does matter. Ensure the purifier matches your room’s size.


Best For Large Rooms



Best Performance






Smart Air Purifier



Smart Auto Cleaner



For Larger Bedrooms



For Larger Bedrooms


Table Of Content

Best Air Purifiers for Large Rooms

With a robust exterior, the Medify MA-112 boasts dual filters, establishing its dominance for expansive spaces. 

Furnished with three comprehensive filters, it ensures the elimination of VOCs, odors, and microparticles. Notably, its CADR rating per the Energy Star certificate stands at 560 CFM.

The Medify MA-112 v2.0 air purifier is a modern and sleek device that comes in two color schemes: white and black. 

This Medify MA-112 air purifier has a larger body, carrying twice as many air filters. That is why it is the best purifier for a large room. This air purifier has a width of 15.7 inches and a height of 28.3 inches.

The Medify MA-112 v2.0 air purifier contains three filters, the activated carbon filter, prefilter, and True HEPA filter. The Medify MA-112 Air Purifier’s activated carbon filter is included in the composite filter to neutralize VOCs and odors.

This layer of the air purifier features activated carbon pellets. 

These carbon pellets are more efficient and can capture odorous and gaseous substances with the help of the thousands of spores present in them.

These carbon pellets are more efficient and can capture odorous and gaseous substances with the help of the thousands of spores present in them. As a result, you can breathe toxin-free and particle-free air.

According to the Energy Star certificate, the Clean Air Delivery Rate, or CADR Rating, for the Medify MA-112 is 560 CFM.


  • It is available in two colors.
  • It has a modern touch control panel.
  • It comes with a child lock feature.
  • It has a sleep mode.


  • It has no smart control.
  • It has no auto mode.

A groundbreaking product, the AirDoctor 5500 promises unmatched particle removal, even capturing ones as minuscule as 0.003 microns. Its medium size doesn’t hinder its prowess to cleanse air up to 868 sq. ft., five times hourly.

It also has many smart features, such as real-time particle sensors measuring air quality and automatically adjusting the fan speed. That way, you can save energy.


  • Ultra Lock Space Technology
  • Auto Sensor With Air Quality Indicator
  • Automatic Mode
  • 24-Hour Timer
  • Stylish Design


  • No Remote

Crafted for efficiency, the BreatheSmart 75i is both energy-conservative and potent, purifying large expanses quickly. What makes it standout is the variety of filters tailored to specific needs, catering to different types of pollutants.

The sound level of 25 decibels is similar to whispering at a distance of a few feet; therefore, it will not wake you up while you sleep. The sound level of 49 dB is comparable to that of a refrigerator.

Many users may be able to sleep through it without difficulty. The sound that BreatheSmart 75i produces is Pink noise. This noise has a lower frequency and is thought to promote better sleep.


  • It is ideal for large rooms.
  • It comes with a lifetime warranty.
  • It contains air quality sensors.


The Coway Airmega 400 Smart Air Purifier is one of the best choice for larger rooms.

Two colors: silver and graphite.

When used as directed, the Coway Airmega 400 room air purifier detoxifies at least twice an hour and can cover rooms up to 624 sq. ft. (5x hourly).  

Aesthetically pleasing and technologically advanced, the Airmega 400 assures detoxification twice hourly in rooms up to 624 sq. ft. The two-stage filtration system guarantees 99.97% pollutant removal.

The noise level of this air purifier varies between 22 and 52 decibels (dB). So despite having a higher fan power, the Coway Airmega 400 is quiet and would not disturb your sleep.


  • It is energy efficient.
  • It comes with a five-year warranty.
  • It is WIFI compatible.


  • Heavy and Large size

Okaysou is one brand that misled consumers when telling their air purifier capacity. 

Recommended is 4-5 air changes per hour, so when we calculate it to that we see 300 sq. ft. (5x hourly) covered.  

While it boasts a large coverage area, it’s essential to note that its optimal performance occurs at 300 sq. ft with 5 air changes per hour. 

It employs a comprehensive four-stage filtration system and integrates real-time air quality sensors including a pre-filter, activated carbon filter, HEPA filter, and UVC light to provide fresh air for your home or office.

Auto mode adjusting fan speed in real-time


  • It weighs 6.6 lbs.
  • Certifications like CE, ETL, CARB
  • Sensitive Auto-Mode
  • Low Energy Consumption
  • Real-Time Air Quality Indicator
  • Intelligent Air Quality Sensor


  • Not made of the best quality materials
  • Small motor

HATHASPACE Smart Air Purifier 2.0 makes it easy to see when it’s time to turn on the cleaner and live better because of an AQI indicator.

Coverage Area: 300 sq. ft. (5x hourly) 

For its huge size, unfortunately the performance doesn’t match. It has a pre-filter, H13 HEPA filter, and carbon filter, cleaning 99.97% of airborne particles as small as 0.3 microns.


  • Sleek and Modern Design
  • 5 Stage Purification
  • Certified Energy Star
  • Medical Grade H13 HEPA Filter
  • 100% ozone-free, CARB approved, Energy
  • Particle sensor, AQI display


  • Not Wi-Fi or app-enabled
  • The CADR is not AHAM verified

It is an ideal air purifier that filters particle and gaseous air pollutants without creating ozone or other potentially dangerous byproducts. That is why Levoit LV-H133 is the safest option.

This air purifier contains three filters: a true HEPA filter, a pre-filter, and an activated carbon filter. The prefilter carries huge air pollutants such as dust, hair, lint, and pet fur.

The Levoit LV-H133 Air Purifier’s true HEPA filter catches and eliminates smaller particles up to 0.3 microns. Last but not least, there’s an activated carbon filter. Thanks to its granular activated carbon structure, this filter can absorb all types of odors from smoke to mold.

The Levoit LV-H133 Air Purifier is best for large rooms and can cover 411 sq. ft. (5x hourly).

The noise level of this air purifier does not surpass 54 dB. This is the sound of an average home conversation or numerous huge electrical transformers at a distance of at least 100 feet.


  • It has low noise levels.
  • It has air quality sensors.
  • The air filter contains a built-in display.


  • It has no smart feature.
  • There is no remote control option.

Large Space Air Purifiers Buying Guide

Size: Opt for a unit that aligns with your room size. Small purifiers may underperform in large rooms.

Number of Filters: Determine the filter types you need, whether it’s HEPA, carbon, or others.

CADR Rating: For spaces up to 1,200 sq. ft., a CADR between 300 and 400 is optimal. Remember, a higher CADR implies better efficiency.

Noise Level: A pricey unit doesn’t always mean quieter operation. Ensure the sound level is comfortable.

Air Changes Per Hour (ACH): Seek a minimum ACH rating of five for spacious rooms.

How Large Area Can an Air Purifier Cover?

If you are planning to buy an air purifier for your large room, make sure to buy a large one. A small air purifier won’t cover much surface area in your room, which would kill the reason behind buying it.
While on the other hand, a large air purifier can cover a 500 to 1000 sq ft area. That is why a large air purifier can purify the air perfectly.

Benefits Of a Large Room Air Purifiers

Air Purifiers are vital to those living with allergies or asthma. But getting rid of airborne toxins can be challenging if you have ample space or live in a climate where windows are seldom opened. So it’s time to invest in a large room air purifier.

Here are some benefits of having a large room Air Purifier:

  • Rapid air purification
  • Long-term cost savings, particularly concerning health expenses
  • Improved sleep quality, especially for those with respiratory sensitivities.

Large Room Air Purifiers FAQ

Any air purifier can remove dust, pollen, and other contaminants from the rooms in which they are installed. However, you must ensure that the air purifier you purchase is appropriate for the size of the space.

If you buy the improper air purifier model, the air in the room will most likely not be cleaned effectively.

It relies on the air purifier’s power and how much space it is equipped to clean.

If the air purifier’s capacity or CADR rating is too large for your space, it will cause issues. If the CADR rating of the air purifier you’re contemplating surpasses the room area by a significant amount, it might be too large for your room. Getting an air purifier with a good CADR rating is always preferable.

That is, having a slightly larger air purifier is preferable to having one that is too small for your room. If you try to save money by buying an air purifier that is too tiny for your space, you will be defeating the device’s purpose.

The purifier will not filter the indoor air to an acceptable level. On the other hand, an air purifier device with a CADR rating slightly larger than your room size will operate flawlessly.

Small Air Purifier: Standard for personal spaces and rooms up to 200 square feet. 

Medium Air Purifier: Ideal for rooms between 200 and 400 square feet.

Large Air Purifier: Best for rooms between 400 and 1,500 square feet. 

For example, if you want to use an air purifier in your bedroom with a closed door and windows, it’s essential to know how big that room is and how tall the ceiling is. For example, if the room is 12 (twelve) feet by 15 feet with 8-foot ceilings, you would need an air purifier that covers 240 square feet or more because something like this would allow for enough absorption of all particles in the air.

Small air purifiers are only suitable for spaces that are less than 300 square feet in size. If the room is any larger, you’ll need a more powerful air purifier. A small air purifier will not complete the job. For rooms with less area, small air purifiers may be sufficient.

Even if your bathroom is small, you can consider using an air purifier. A small air purifier will only work well in a larger room if numerous similar air purifiers are positioned in various corners of the room.

Multiple tiny air purifiers in one location can outperform a single large air purifier at a high cost. Therefore, a small air purifier can work in large rooms only if the purifier capacity is matched to the size of the space in which it will be used.

Therefore, purchasing an air purifier smaller for the size of your room will be a waste of money as it won’t work efficiently.

Yes, you can, but the only thing to remember is that each air purifier is meant to cover specific square footage, so putting two devices in one room that are too efficient to clean is a waste of money.

To avoid high costs, ensure that the coverage area is large enough to support two or more air purifiers. Furthermore, both air purifiers should use different filtration processes.

It would be best if you always chose the air purifier that goes with the size of your room. If your room is small, go for a small air purifier; if it is large, you must buy a large one to get maximum results.

A small air purifier would not efficiently work in a large room, killing its purpose. That is why you must first determine the room’s accurate size you wish to purify before selecting the appropriate air purifier size. Then you’ll want to get an air purifier that meets or exceeds those requirements.

For the purest air, choosing the proper air purifier size is critical. An air purifier can technically be too large for a room. It will, however, clear the air effectively.

Cleaning a room with an air purifier might take 45 minutes to two hours. You must consider the air purifier’s purifying coverage, room size, and fan speed to better estimate how long it will take to cover a space. While some air purifier companies claim that a whole room’s air may be purified in as little as 30 minutes.

However, this is only possible in small rooms. At the same time, an air purifier in a large room will take more time. That is why it’s fair to expect the air to clear out after at least 45 minutes.

An air purifier doesn’t eliminate moisture from the air. It can, however, make the air feel drier, mainly if your air purifier is too big in size for your room or is operating too fast. In the winter, air purifiers are frequently utilized to substitute ventilation.

However, because chilly winter air is usually dry, the air cleaner is not to blame for the dryness. The air purifier can only trap pollutants such as dust, pet hair, mold, pollen, and so on; it can’t remove moisture from the air. When the indoor air is cold, low humidity is more typical.


When investing in an air purifier for larger spaces, thorough research is crucial. This guide aids in understanding the essential factors, ensuring you make an informed decision.

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