Every best energy efficient smart air purifier pick here publishes a wattage figure on its listing. We compared five Wi-Fi models on listed watts, sensors, voice control and room coverage.
See also our best smart air purifier and energy efficient smart air purifier reviews guides. Every pick comes from the makers’ specifications on each Amazon listing, not our own testing, and our Editorial Policy explains how we work. Replace filters on the schedule each maker lists and keep the air intake clear.
Our Top 3 Picks for the Best Energy Efficient Smart Air Purifier
Levoit Core 400S-P smart air purifier with 24 watt listing and laser PM2.5 sensor
- Lists 24 watts, the lowest of these five
- AirSight Plus laser sensor shows PM2.5 in real time
- VeSync app sets schedules and timers and tracks filter life
Frigidaire PureA300 smart HEPA air purifier with 25 watt listing
- Lists 25 watts
- Lists 20 dB, the lowest of these five
- Frigidaire app sets schedules and monitors filter life
DHYALA KJ02 smart air purifier with 271 CFM CADR
- CADR of 271 CFM, listed for 3,620 sq ft in one hour
- 5-stage filtration with an electrostatic pre-filter
- Alexa, Google Assistant and app control
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Low-Wattage Smart Air Purifiers Compared
| # | Product | Key Features | |
|---|---|---|---|
| 1 |  Levoit Core 400S-P smart air purifier with 24 watt listing and laser PM2.5 sensor |
| Check Latest Price |
| 2 |  Frigidaire PureA300 smart HEPA air purifier with 25 watt listing |
| Check Latest Price |
| 3 |  DHYALA KJ02 smart air purifier with 271 CFM CADR |
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| 4 |  Levoit Core 300S-P smart air purifier with Auto Mode |
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| 5 |  Levoit Vital Pet smart air purifier with odor and PM2.5 sensors |
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1. Levoit Core 400S-P smart air purifier with 24 watt listing and laser PM2.5 sensor
Best Overall
- Lists 24 watts, the lowest of these five
- AirSight Plus laser sensor shows PM2.5 in real time
- VeSync app sets schedules and timers and tracks filter life
- Alexa and Google Assistant voice control
- Weighs 12.8 pounds versus Frigidaire PureA300 and Levoit Core 300S-P at 7.5, DHYALA KJ02 9 and Levoit Vital Pet 9.7
- Lists 24 dB, above Frigidaire PureA300 at 20, Levoit Vital Pet at 21 and DHYALA KJ02 at 22
- Weight: 12.8 lb
- Low Noise: 24 dB
- Size: 10.8 x 10.8 x 20.5 in
Auto Mode reads the PM2.5 level and changes fan speed to match. Sleep Mode runs the lowest fan setting and dims the display.
Levoit lists a 3-stage filter with a pre-filter, a main filter and an activated carbon layer for smoke and odors. The listing names ETL and FCC certification.
Good match for the Levoit Core 400S-P
It suits buyers who want the lowest listed wattage here with a live PM2.5 reading.
When to choose another pick over the Levoit Core 400S-P
Skip it if you move it between rooms, since Frigidaire PureA300 and Levoit Core 300S-P weigh 7.5 pounds.
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2. Frigidaire PureA300 smart HEPA air purifier with 25 watt listing
Most Quiet
- Lists 25 watts
- Lists 20 dB, the lowest of these five
- Frigidaire app sets schedules and monitors filter life
- Works with Alexa and Google Assistant
- Lists 3 filter stages, fewer than DHYALA KJ02 at 5
- Weight: 7.5 lb
- Low Noise: 20 dB
- Coverage: 850 sq ft at 1 air change per hour
Frigidaire lists 1 air change per hour in rooms up to 850 sq ft. Smart Mode adjusts settings as air quality changes, and a light indicator shows the current level.
The PureAir RAC-16 HEPA filter is listed to capture up to 99.99% of particles as small as 0.3 microns. The listing names UL and FCC certification.
Good match for the Frigidaire PureA300
It suits a bedroom where low listed noise and low wattage both matter.
When to choose another pick over the Frigidaire PureA300
Skip it if you want a laser PM2.5 reading, since Levoit Core 400S-P lists AirSight Plus.
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3. DHYALA KJ02 smart air purifier with 271 CFM CADR
Best Listed CADR
- CADR of 271 CFM, listed for 3,620 sq ft in one hour
- 5-stage filtration with an electrostatic pre-filter
- Alexa, Google Assistant and app control
- Sleep mode lists 22 dB
- Lists 38 watts, above Levoit Core 400S-P at 24 and Frigidaire PureA300 at 25
- Weight: 9 lb
- Sleep Noise: 22 dB
- CADR: 271 CFM
The app covers power, custom and sleep modes, timer, fan speed and filter change reminders. A large screen shows air conditions in real time.
Pet features include a lying platform, a bite-proof power cord and a pet and child lock. The unit measures 9.84 by 9.84 by 20.15 inches.
Good match for the DHYALA KJ02
It suits open floor plans where a listed CFM figure matters more than the lowest wattage.
When to choose another pick over the DHYALA KJ02
Skip it if the lowest wattage comes first, since Levoit Core 400S-P lists 24 watts.
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4. Levoit Core 300S-P smart air purifier with Auto Mode
Most Compact
- Measures 8.66 by 8.66 by 14.17 inches and weighs 7.5 pounds
- Auto Mode adjusts fan speed to PM2.5 and updates the indicator rings
- VeSync app sets schedules and timers and checks filter life
- Works with Alexa and Google Assistant
- Lists 39 watts, above Levoit Core 400S-P at 24, Frigidaire PureA300 at 25 and DHYALA KJ02 at 38
- Levoit warns that off-brand filters may damage this purifier
- Weight: 7.5 lb
- Size: 8.66 x 8.66 x 14.17 in
- Filter: 3-stage
Sleep Mode turns off the display lights and lowers noise. Levoit lists an activated carbon filter for kitchen smells, smoke and VOCs.
The listing names ETL and FCC certification. A 3-stage original filter comes pre-installed.
Good match for the Levoit Core 300S-P
It suits a nightstand or shelf where a small footprint matters.
When to choose another pick over the Levoit Core 300S-P
Skip it if you want a lower listed wattage, since Frigidaire PureA300 lists 25 watts.
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5. Levoit Vital Pet smart air purifier with odor and PM2.5 sensors
Best Pet Plus Mode
- Odor and PM2.5 sensors adjust fan speed automatically
- Lists noise as low as 21 dB
- Pet Plus mode offers custom settings for walks and time away
- Washable pre-filter and a chew-resistant cable
- Lists 41 watts versus Levoit Core 400S-P at 24, Frigidaire PureA300 25, DHYALA KJ02 38 and Levoit Core 300S-P 39
- Weight: 9.7 lb
- Low Noise: 21 dB
- Room Size: 222 sq ft
A wide U-shaped inlet targets floating pet hair. Levoit lists the Vital Pet for rooms up to 222 sq ft.
The VeSync app, voice control and smart scheduling handle daily routines. A filter indicator light and a display lock round out the controls.
Good match for the Levoit Vital Pet
It suits pet owners who want an odor sensor and accept a higher listed wattage.
When to choose another pick over the Levoit Vital Pet
Skip it if you want the lowest wattage, since Levoit Core 400S-P lists 24 watts.
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How to Choose the Best Energy Efficient Smart Air Purifier
- Read the listed wattage. Levoit Core 400S-P lists 24 watts, Frigidaire PureA300 25, DHYALA KJ02 38, Levoit Core 300S-P 39 and Levoit Vital Pet 41.
- Pair wattage with room size. DHYALA KJ02 lists 3,620 sq ft in one hour, and Frigidaire PureA300 lists 850 sq ft at 1 air change per hour.
- Look for automatic fan control. Levoit Core 400S-P and Levoit Core 300S-P adjust to PM2.5, and Levoit Vital Pet adds an odor sensor.
- Compare low noise. Frigidaire PureA300 lists 20 dB and Levoit Vital Pet 21 dB. DHYALA KJ02 lists 22 dB in sleep mode and Levoit Core 400S-P 24 dB.
- Match voice control. Levoit Core 400S-P, Frigidaire PureA300, DHYALA KJ02 and Levoit Core 300S-P list both Alexa and Google Assistant.
Frequently Asked Questions
Which pick lists the lowest wattage?
Levoit Core 400S-P lists 24 watts. Frigidaire PureA300 follows at 25 watts.
Which pick covers the most space in an hour?
DHYALA KJ02 lists 3,620 sq ft in one hour with a CADR of 271 CFM. Frigidaire PureA300 lists 850 sq ft at 1 air change per hour.
Which pick lists the lowest noise?
Frigidaire PureA300 lists 20 dB. Levoit Vital Pet follows at 21 dB.
Which picks set schedules in an app?
Levoit Core 400S-P, Levoit Core 300S-P and Frigidaire PureA300 list app schedules. Levoit Vital Pet lists smart scheduling, and DHYALA KJ02 lists an app timer.
The Bottom Line
Our best energy efficient smart air purifier pick is the Levoit Core 400S-P for its 24 watt listing and laser PM2.5 sensor. Choose Frigidaire PureA300 for 20 dB at 25 watts and DHYALA KJ02 for 271 CFM.
Best Overall: Levoit Core 400S-P smart air purifier with 24 watt listing and laser PM2.5 sensor Check Latest Price
Most Quiet: Frigidaire PureA300 smart HEPA air purifier with 25 watt listing Check Latest Price
Best Listed CADR: DHYALA KJ02 smart air purifier with 271 CFM CADR Check Latest Price
Check each listing for current filter part numbers before you order replacements.
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