Keeping the air clean in a large room can be challenging. With more space to cover, you need an air purifier powerful enough to effectively filter all the air. The best air purifiers for large rooms have high CADR ratings, cover 500-1,500 square feet, and feature large true HEPA filters to capture airborne particles.

What to Consider When Buying an Air Purifier for a Large Room

When selecting an air purifier for a spacious room, keep these factors in mind:

Room Size – Measure your room’s dimensions to determine the square footage. Look for air purifiers made for room sizes equal to or larger than yours. Models made for smaller spaces won’t be effective.

CADR Ratings – Clean Air Delivery Rate (CADR) indicates volume of filtered air. Higher numbers mean faster air purification. Target a minimum smoke/dust/pollen CADR of 300+ for rooms over 500 square feet.

Filters – True HEPA filters remove 99.97% of particles 0.3 microns, great for allergens and smoke. Activated carbon filters help with odors and gases.

Automatic Mode – Auto modes adjust fan speed based on air quality readings for efficient operation. This saves energy and filter life when pollutants are low.

Noise Level – Check decibel ratings if sound is a concern. Under 30dB is very quiet. 40-50dB is average for an air purifier. Over 60dB can be disruptive.

Smart Features – Many models now connect to apps via WiFi and some even support voice controls. This allows remote monitoring and control.

The Best Air Purifiers for Large Rooms

Based on the above criteria, below are our top recommendations for the best air purifiers to effectively clean the air in spacious areas over 500 square feet:

1. Alen BreatheSmart Classic Large Room Air Purifier

Room Size: 1,100 square feet

CADR Rating: 310

Filter Type: True HEPA + Carbon

Noise Level: 51 dB

With its high 310 CADR rating, the Alen BreatheSmart Classic can filter the air in rooms up to 1,100 square feet twice per hour. It uses a true HEPA filter to capture 99.97% of particles down to 0.3 microns such as dust, pollen, mold, bacteria and pet dander.

An activated carbon filter also helps remove household odors and gaseous pollutants. Automatic SmartSensor mode adjusts the fan speed based on air quality. Four fan speeds are available for manual control.

At medium speed, this air purifier produces only 51 dB of noise, quieter than an average conversation. It measures 27 x 18 x 10 inches with an attractive, compact tower design. The BreatheSmart Classic is also backed by a lifetime warranty.

Key Features:

  • Covers 1,100 sq ft
  • 310 CADR Rating
  • True HEPA + Carbon Filters
  • Auto SmartSensor Mode
  • Lifetime Warranty

2. Honeywell HPA300 True HEPA Air Purifier

Room Size: 465 square feet

CADR Rating: 320

Filter Type: True HEPA + Carbon

Noise Level: 51 dB

The Honeywell HPA300 air purifier is rated to filter extra large rooms up to 465 square feet. With a powerful 320 CADR rating, it can filter air over 5 times per hour in a room this size.

It utilizes a true HEPA filter and activated carbon pre-filter to remove up to 99.97% of microscopic particles 0.3 microns in size. An Intelli-Check electronic filter indicator alerts you when it’s time to check or change the filters.

Three speed settings plus an auto mode adjust airflow as needed. At its lowest speed of 51 dB, the HPA300 operates quietly. This ENERGY STAR certified air purifier measures 21.7 x 21.7 x 33.3 inches tall.

Key Features:

  • Covers 465 sq ft
  • 320 CADR Rating
  • Auto Mode
  • True HEPA + Carbon Filters
  • 3 Speeds + Auto Mode

3. Coway Airmega 400 Smart Air Purifier

Room Size: 1,560 square feet

CADR Rating: 350 cfm

Filter Type: True HEPA

Noise Level: 43.2 dB

The Coway Airmega 400 has an extra powerful fan to cover large rooms up to 1,560 square feet. Its supreme 350 cfm CADR rating allows it to filter all the air in a room this size over 2.5 times per hour.

It Features a true HEPA filter that captures 99.97% of particles as small as 0.3 microns such as pollen, smoke, mold spores and pet dander. The pre-filter and activated carbon filter work together to further remove odors.

Pollution levels are monitored with a particle sensor and auto mode adjusts the fan speed accordingly. Air quality readings can also be checked on the unit’s colorful LED ring or Coway’s mobile app. The Airmega 400 purifies efficiently while producing only 43.2 dB of noise.

Key Features:

  • Covers 1,560 sq ft
  • 350 CADR Rating
  • Auto Mode with Pollution Sensor
  • True HEPA Filter
  • Mobile App Connectivity

4. Medify Air MA-112 Air Purifier

Room Size: 2,000 square feet

CADR Rating: 640 cfm

Filter Type: H13 True HEPA + Carbon

Noise Level: 52.8 dB

With an extra powerful 640 cfm CADR rating, the Medify Air MA-112 can filter all the air in extra large rooms up to 2,000 square feet every hour. This makes it one of the more powerful options for big spaces.

It combines a medical-grade H13 true HEPA filter and activated carbon filter to remove particulates, allergens, odors and gaseous pollutants. The pre-filter catches larger particles like hair and pet fur.

There are three fan speeds to choose from, including an ultra-quiet sleep mode. The automatic mode adjusts the fan speed based on the room’s air quality. At low speeds, it produces only 52.8 dB of noise. This ENERGY STAR certified purifier measures 28 x 20 x 12 inches.

Key Features:

  • Covers 2,000 sq ft
  • 640 CADR Rating
  • H13 True HEPA + Carbon Filters
  • Auto Mode
  • Sleep Mode

5. Airocide AIRP500 Air Purifier

Room Size: 1,250 square feet

CADR Rating: N/A

Filter Type: None (uses photocatalytic oxidation)

Noise Level: 30 dB

The Airocide AIRP500 is an air purifier that uses patented photocatalytic oxidation technology instead of traditional filters. It’s designed to completely destroy airborne mold, bacteria, viruses, VOCs and more down to the microbial level without producing any ozone.

This chemical-free process allows it to effectively clean the air in large rooms up to 1,250 square feet. It’s also very energy efficient, using only 60 watts. There are no filters to replace, just an occasional bulb replacement.

At its lowest fan speed, the AIRP500 operates at an extremely quiet 30 dB, making it unobtrusive. This air purifier measures 21 x 21 x 21 inches with an elegant design featuring solid wood trim.

Key Features:

  • Covers 1,250 sq ft
  • Uses Photocatalytic Oxidation
  • No Filters to Replace
  • Extremely Quiet 30 dB Noise Level

So there you have it – the top air purifiers for effectively cleaning large rooms over 500 square feet. All of these models have high CADR ratings and large coverage capacities. Most feature true HEPA and activated carbon filters to remove all types of indoor air pollutants. Smart sensors and auto modes allow the fan speed to adjust based on air quality readings for efficient operation. For spacious rooms, these are the best performing air purifiers available.

When investing in an air purifier for a large room, it’s worth spending more upfront for adequate cleaning power and Features. Buying too small of an air purifier to try and save money won’t properly filter all the air in your space.

On the other hand, don’t assume you need an industrial-sized model either unless you truly have an extremely large open area to cover. Measure your actual square footage and target your search accordingly.

What Size Room Do You Need to Purify?

Here’s a quick reference guide on what size air purifier you need based on room dimensions:

100 – 300 square feet – Small air purifiers like desktop models are ideal for single rooms up to 300 square feet, including home offices, small bedrooms and nurseries.

300 – 500 square feet – For mid-sized rooms like master bedrooms, living rooms and open kitchens, look for an air purifier with around a 200 CADR rating.

500 – 900 square feet – Large open spaces like studio apartments, large living rooms and game rooms need an air purifier with a CADR rating over 300+ to handle the size.

900+ square feet – Extra large rooms like lofts, high ceilings, industrial spaces and open floor plans require commercial-grade air purifiers with very high 400+ CADR ratings and coverage capacities over 1,500 square feet.

As you can see, the power and capacity required increases exponentially with room size due to factors like air volume, ceiling height and open layouts. Again, always measure your actual space instead of estimating. An accurate room size ensures you get an air purifier powerful enough to properly clean the air.

Added Features to Consider

Beyond just core function, several extra Features can improve convenience and customization. Here are some to look for when shopping:

Multiple Fan Speeds – Manually controlling fan speeds allows choosing between extra quiet, normal, and max power settings as needed. This also saves energy when pollutants are lower.

Air Quality Sensors – Built-in particle sensors actively monitor air quality and trigger auto fan speed adjustments for efficient operation without guesswork.

Filter Change Indicators – Smart sensor alerts notify you when it’s time to check or replace filters based on run time hours.

App/Voice Control – WiFi connectivity allows controlling the air purifier remotely via mobile app or voice assistants like Alexa.

Air Quality Reports – Internet-connected models can provide air quality reports and logging of historical data. Some generate home air quality index scores.

Scheduling – Set schedules to have your air purifier automatically turn on or off at certain times of day. Helpful for nighttime operation.

Multiple Filter Layers – Look for at least a pre-filter, true HEPA filter, and activated carbon filter. More layers catch more particle sizes.

Certifications – ENERGY STAR, AHAM Verifide, CARB, and FCC certifications indicate reliable, efficient and safe operation of electronic air purifiers.

Warranties – Multi-year warranties (5 years+) show the manufacturer stands behind their product’s performance.

Automatic Modes – Special auto modes like sleep mode minimize noise during the night or away mode which uses less energy when no one’s home to save electricity when running 24/7.

Prioritizing your needs and room size helps narrow the options. But considering extra beneficial Features takes your purchase to the next level.


What is the difference between HEPA and activated carbon filters?

HEPA filters are designed to trap small particles like allergens, dust, and pet dander. Activated carbon filters work by absorbing odors, smoke, chemicals, and other gaseous pollutants. Some air purifiers use a combination of both types of filters for maximum effectiveness.

How often do I need to replace the filter in my air purifier?

It depends on the model and usage level. Most manufacturers recommend replacing the filter every 6-12 months. However, if you have pets or live in an area with high levels of pollution or allergies, you may need to replace it more frequently.

Can air purifiers help with asthma and allergy symptoms?

Yes! Air purifiers can significantly reduce airborne allergens like pollen, dust mites, mold spores that trigger allergy symptoms such as sneezing and runny nose. They can also remove irritants like smoke and chemical fumes that can aggravate asthma symptoms such as coughing and wheezing.


Hey there, I'm Kevin, editor of Xievo. I'm passionate about air purifiers and providing accurate information to help readers make informed decisions. In my free time, I love hiking and experimenting with air purifiers in my own home. Thanks for visiting Xievo!