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Most Energy-Efficient Air Purifiers (CADR per Watt)

49 qualify, listed by cadr per watt. Updated October 18, 2026.

1
Medify MA-112
$450
3.4
950 cfmsmoke CADR
1,472 sq ftAHAM room size
60 dBat full speed
95 Wmax power
Value Quietness Filter cost

Twin-filter unit with very high claimed CADR; not AHAM listed.

One air change of a 300 sq ft room in about 3 min$260 a year in filters$1,750 to own for 5 years
Amazon · $450MedifyFull review
2
Levoit Core 600S
Levoit Core 600S
#2 of 5 in extra large · independently tested
$250
3.8
410 cfmsmoke CADR
636 sq ftAHAM room size
55 dBat full speed
49 Wmax power
Value Quietness Filter cost

Large-room CADR from a light, efficient unit; short filter life raises running cost.

One air change of a 300 sq ft room in about 6 min$120 a year in filters$850 to own for 5 yearsAHAM Verifide CADR
Amazon · $250LevoitFull review
3
$200
3.7
250 cfmsmoke CADR
388 sq ftAHAM room size
50 dBat full speed
30 Wmax power
Value Quietness Filter cost

Efficient medium-room unit; superseded by the 311i Max.

One air change of a 300 sq ft room in about 10 min$120 a year in filters$800 to own for 5 yearsAHAM Verifide CADR
Amazon · $200BlueairFull review
4
Blueair Blue Pure 211i Max
$300
3.9
400 cfmsmoke CADR
620 sq ftAHAM room size
53 dBat full speed
52 Wmax power
Value Quietness Filter cost

Quieter and more efficient than the 211+, with app control.

One air change of a 300 sq ft room in about 6 min$140 a year in filters$1,000 to own for 5 yearsAHAM Verifide CADR
Amazon · $300BlueairFull review
5
Levoit EverestAir
Levoit EverestAir
#5 of 18 in large · independently tested
$400
3.7
360 cfmsmoke CADR
558 sq ftAHAM room size
52 dBat full speed
49 Wmax power
Value Quietness Filter cost

Levoit's flagship with a laser sensor and directional vent; expensive for the CADR.

One air change of a 300 sq ft room in about 7 min$160 a year in filters$1,200 to own for 5 yearsAHAM Verifide CADR
Amazon · $400LevoitFull review
6
Blueair Blue Pure 311i Max
Blueair Blue Pure 311i Max
#4 of 18 in large · independently tested
$170
3.7
250 cfmsmoke CADR
388 sq ftAHAM room size
50 dBat full speed
36 Wmax power
Value Quietness Filter cost

Medium-room Blueair with very low power draw and app.

One air change of a 300 sq ft room in about 10 min$120 a year in filters$770 to own for 5 yearsAHAM Verifide CADR
Amazon · $170BlueairFull review
7
Levoit Core 400S
Levoit Core 400S
#2 of 18 in large · independently tested
$180
3.8
260 cfmsmoke CADR
403 sq ftAHAM room size
52 dBat full speed
38 Wmax power
Value Quietness Filter cost

Very efficient CADR per watt; filters are rated for only six months.

One air change of a 300 sq ft room in about 9 min$100 a year in filters$680 to own for 5 yearsAHAM Verifide CADR
Amazon · $180LevoitFull review
8
Smart Air Blast Mini MK II
$500
2.5
435 cfmsmoke CADR
674 sq ftAHAM room size
57 dBat full speed
65 Wmax power
Value Quietness Filter cost

Steel-cabinet workhorse with published test data; no sensor, no app.

One air change of a 300 sq ft room in about 6 min$110 a year in filters$1,050 to own for 5 years
Amazon · $500Smart AirFull review
9
Blueair Blue Pure 411i Max
Blueair Blue Pure 411i Max
#5 of 22 in medium · independently tested
$110
3.4
130 cfmsmoke CADR
202 sq ftAHAM room size
46 dBat full speed
20 Wmax power
Value Quietness Filter cost

Tiny bedroom unit with auto mode and app; fine for a small room, not a living room.

One air change of a 300 sq ft room in about 18 min$80 a year in filters$510 to own for 5 yearsAHAM Verifide CADR
Amazon · $110BlueairFull review
10
Dreo Macro Pro
#1 of 18 in large
$130
4.1
258 cfmsmoke CADR
400 sq ftAHAM room size
53 dBat full speed
40 Wmax power
Value Quietness Filter cost

Strong CADR per dollar with app and auto mode; very quiet on low.

One air change of a 300 sq ft room in about 9 min$100 a year in filters$630 to own for 5 yearsAHAM Verifide CADR
Amazon · $130DreoFull review
11
Levoit Vital 200S
Levoit Vital 200S
#1 of 22 in medium · independently tested
$150
3.7
245 cfmsmoke CADR
380 sq ftAHAM room size
54 dBat full speed
38 Wmax power
Value Quietness Filter cost

Adds a washable prefilter and a pet-hair mode to the Core 400S formula.

One air change of a 300 sq ft room in about 10 min$100 a year in filters$650 to own for 5 yearsAHAM Verifide CADR
Amazon · $150LevoitFull review
12
Coway Airmega 100
Coway Airmega 100
#13 of 22 in medium · independently tested
$130
3.1
148 cfmsmoke CADR
229 sq ftAHAM room size
57 dBat full speed
23 Wmax power
Value Quietness Filter cost

Coway's bedroom unit with auto mode. CADR is derived from Coway's 222 sq ft claim at 5 air changes an hour; no AHAM listing was found.

One air change of a 300 sq ft room in about 16 min$40 a year in filters$330 to own for 5 years
Amazon · $130CowayFull review
13
Winix T810
Winix T810
#14 of 18 in large · independently tested
$249
3.1
267 cfmsmoke CADR
414 sq ftAHAM room size
62 dBat full speed
45 Wmax power
Value Quietness Filter cost

Winix publishes a 267 dust CADR (343 sq ft at 5 air changes); smoke and pollen figures are not published, so dust is used for all three. App control and a heavy carbon filter at a mid-range price.

One air change of a 300 sq ft room in about 9 min$90 a year in filters$699 to own for 5 yearsAHAM Verifide CADR1.2 lb activated carbon
Amazon · $249WinixFull review
14
Alen BreatheSmart 75i
Alen BreatheSmart 75i
#8 of 18 in large · independently tested
$599
3.4
347 cfmsmoke CADR
538 sq ftAHAM room size
49 dBat full speed
60 Wmax power
Value Quietness Filter cost

Quiet at full speed and well built; price per CADR is high.

One air change of a 300 sq ft room in about 7 min$99 a year in filters$1,094 to own for 5 yearsAHAM Verifide CADR
Amazon · $599AlenFull review
15
Blueair Blue Pure 211+
#11 of 18 in large · independently tested
$250
3.4
350 cfmsmoke CADR
542 sq ftAHAM room size
56 dBat full speed
61 Wmax power
Value Quietness Filter cost

High CADR, simple one-button operation, fabric prefilter; no auto mode and short filter life.

One air change of a 300 sq ft room in about 7 min$140 a year in filters$950 to own for 5 yearsAHAM Verifide CADR
Amazon · $250BlueairFull review
16
Blueair Blue Pure 211+ Auto
#10 of 18 in large · independently tested
$280
3.4
350 cfmsmoke CADR
542 sq ftAHAM room size
56 dBat full speed
61 Wmax power
Value Quietness Filter cost

211+ with a particle sensor and auto mode.

One air change of a 300 sq ft room in about 7 min$140 a year in filters$980 to own for 5 yearsAHAM Verifide CADR
Amazon · $280BlueairFull review
17
Levoit Vital 100S
Levoit Vital 100S
#11 of 22 in medium
$100
3.3
130 cfmsmoke CADR
202 sq ftAHAM room size
50 dBat full speed
23 Wmax power
Value Quietness Filter cost

Compact with a washable prefilter and auto mode.

One air change of a 300 sq ft room in about 18 min$70 a year in filters$450 to own for 5 yearsAHAM Verifide CADR
Amazon · $100LevoitFull review
18
$550
2.6
300 cfmsmoke CADR
465 sq ftAHAM room size
51 dBat full speed
55 Wmax power
Value Quietness Filter cost

Premium build and very quiet low speed; CADR per dollar is poor.

One air change of a 300 sq ft room in about 8 min$240 a year in filters$1,750 to own for 5 yearsAHAM Verifide CADR
Amazon · $550BlueairFull review
19
Coway Airmega 400
Coway Airmega 400
#7 of 18 in large
$379
3.5
350 cfmsmoke CADR
542 sq ftAHAM room size
52 dBat full speed
66 Wmax power
Value Quietness Filter cost

High CADR at a quiet 52 dB maximum; annual filter cost is among the highest here.

One air change of a 300 sq ft room in about 7 min$130 a year in filters$1,029 to own for 5 yearsAHAM Verifide CADR1.3 lb activated carbon
Amazon · $379CowayFull review
20
Coway Airmega 400S
$449
3.4
350 cfmsmoke CADR
542 sq ftAHAM room size
52 dBat full speed
66 Wmax power
Value Quietness Filter cost

Airmega 400 with Wi-Fi app control.

One air change of a 300 sq ft room in about 7 min$130 a year in filters$1,099 to own for 5 yearsAHAM Verifide CADR1.3 lb activated carbon
Amazon · $449CowayFull review
21
Coway Airmega 300
Coway Airmega 300
#6 of 18 in large
$279
3.6
300 cfmsmoke CADR
465 sq ftAHAM room size
52 dBat full speed
57 Wmax power
Value Quietness Filter cost

Two-sided filtration with a real carbon layer; filters cost more than most.

One air change of a 300 sq ft room in about 8 min$110 a year in filters$829 to own for 5 yearsAHAM Verifide CADR1.1 lb activated carbon
Amazon · $279CowayFull review
22
Alen BreatheSmart 45i
$349
3.2
245 cfmsmoke CADR
380 sq ftAHAM room size
49 dBat full speed
50 Wmax power
Value Quietness Filter cost

Medium Alen with the same quiet motor; lifetime warranty with filter subscription.

One air change of a 300 sq ft room in about 10 min$79 a year in filters$744 to own for 5 yearsAHAM Verifide CADR
Amazon · $349AlenFull review
23
Medify MA-40
Medify MA-40
#15 of 18 in large · independently tested
$170
3.1
330 cfmsmoke CADR
512 sq ftAHAM room size
56 dBat full speed
68 Wmax power
Value Quietness Filter cost

High claimed CADR for the money; not AHAM listed, and filters are short-lived.

One air change of a 300 sq ft room in about 7 min$160 a year in filters$970 to own for 5 years
Amazon · $170MedifyFull review
24
$299
3.1
240 cfmsmoke CADR
372 sq ftAHAM room size
50 dBat full speed
50 Wmax power
Value Quietness Filter cost

45i without the sensor or app.

One air change of a 300 sq ft room in about 10 min$69 a year in filters$644 to own for 5 yearsAHAM Verifide CADR
Amazon · $299AlenFull review
25
Mila Air Purifier
Mila Air Purifier
#18 of 18 in large · independently tested
$299
2.6
263 cfmsmoke CADR
408 sq ftAHAM room size
55 dBat full speed
55 Wmax power
Value Quietness Filter cost

Sensor-heavy smart unit with swappable filter types; filters are expensive.

One air change of a 300 sq ft room in about 9 min$198 a year in filters$1,289 to own for 5 yearsAHAM Verifide CADR
Amazon · $299MilaFull review
26
Winix 9800
Winix 9800
#3 of 5 in extra large
$279
3.8
405 cfmsmoke CADR
628 sq ftAHAM room size
56 dBat full speed
85 Wmax power
Value Quietness Filter cost

Large-room Winix with heavy carbon and app; slightly costlier than the T810.

One air change of a 300 sq ft room in about 6 min$95 a year in filters$754 to own for 5 yearsAHAM Verifide CADR1.2 lb activated carbon
Amazon · $279WinixFull review
27
Coway Airmega 250
Coway Airmega 250
#9 of 22 in medium · independently tested
$229
3.3
240 cfmsmoke CADR
372 sq ftAHAM room size
52 dBat full speed
52 Wmax power
Value Quietness Filter cost

Quiet for its CADR; the 930 sq ft claim is at 1 air change per hour, so treat it as a 370 sq ft unit for allergies.

One air change of a 300 sq ft room in about 10 min$70 a year in filters$579 to own for 5 yearsAHAM Verifide CADR
Amazon · $229CowayFull review
28
Rabbit Air A3
Rabbit Air A3
#16 of 18 in large
$600
3.0
262 cfmsmoke CADR
406 sq ftAHAM room size
51 dBat full speed
57 Wmax power
Value Quietness Filter cost

Rabbit Air's larger unit with app and a laser sensor; premium price.

One air change of a 300 sq ft room in about 9 min$100 a year in filters$1,100 to own for 5 yearsAHAM Verifide CADR
Amazon · $600Rabbit AirFull review
29
Levoit Core 200S
Levoit Core 200S
#1 of 4 in compact · independently tested
$80
4.2
118 cfmsmoke CADR
183 sq ftAHAM room size
46 dBat full speed
26 Wmax power
Value Quietness Filter cost

Smallest Levoit with app control; no particle sensor.

One air change of a 300 sq ft room in about 20 min$38 a year in filters$268 to own for 5 yearsAHAM Verifide CADR
Amazon · $80LevoitFull review
30
$300
2.5
210 cfmsmoke CADR
326 sq ftAHAM room size
52 dBat full speed
50 Wmax power
Value Quietness Filter cost

Claims five years without a filter change; CADR is manufacturer-claimed and the 1400 sq ft figure is at 1 ACH.

One air change of a 300 sq ft room in about 11 minNo replacement filters sold$300 to own for 5 years
Amazon · $300SharkFull review

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