28 Air Purifiers for Rooms 500-699 sq ft, Ranked by Running Cost

← All room sizes

28 ENERGY STAR certified models, from about $15 to $79 a year to run at the US average electricity rate. CADR (PM2.5) is shown for reference — a higher number clears smoke and fine particles faster, independent of running cost. See how we calculate running costs.

Top 5 cheapest to run

All 28 models

Rank	Brand	Model	Room size	CADR (PM2.5)	Energy use	Est. cost/year
1	Rainbow Most Efficient	Luggable XL Ultra	516 sq ft	366	81 kWh/yr	$15
2	Rainbow Most Efficient	Brisk Box Ultra	574 sq ft	404	94 kWh/yr	$17
3	Blueair Most Efficient	3631101000	552 sq ft	351	210 kWh/yr	$38
4	Blueair Most Efficient	3432111100	525 sq ft	351	227 kWh/yr	$42
5	Coway Most Efficient	AP-3018B	640 sq ft	423	235 kWh/yr	$43
6	Amazon Basics	AP5110-UL	502 sq ft	323	239.5 kWh/yr	$44
7	Blueair Most Efficient	3613111100	687 sq ft	450	259 kWh/yr	$47
8	Bosch	Air 6000	525 sq ft	343	289 kWh/yr	$53
9	IQAir	ATEM E	572 sq ft	376	295 kWh/yr	$54
10	Alen	BreatheSmart 75i_V2	574 sq ft	360	304 kWh/yr	$56
11	CUCKOO	CAC-D2020FW	592 sq ft	384	316 kWh/yr	$58
12	Blueair	6712211000	609 sq ft	390	336 kWh/yr	$62
13	Midea	KJ600G-RX600A	567 sq ft	373	341 kWh/yr	$62
14	PureCode	PAR001	567 sq ft	373	341 kWh/yr	$62
15	Sharp	KJ600F-LM1-SH	567 sq ft	373	341 kWh/yr	$62
16	Coway	Airmega 350(W);Airmega 350(BG);Airmega 350(*);AP-1924A_WT;AP-1924A_BG; AP-1924A_*	558 sq ft	369	344 kWh/yr	$63
17	Blueair	Pure 211+	539 sq ft	347	350 kWh/yr	$64
18	Smart Air	CMKQ104	547 sq ft	354	359 kWh/yr	$66
19	Coway	AP-2015F	583 sq ft	380	366 kWh/yr	$67
20	Coway	AP-2425H	586 sq ft	387	366 kWh/yr	$67
21	Wozoyo	Pure Air PA6	563 sq ft	367	373 kWh/yr	$68
22	LEVOIT	LAP-C601S-WUS	606 sq ft	394	387 kWh/yr	$71
23	Coway	Airmega 450(W);Airmega 450(BG);Airmega 450(*);AP-2524B_WT;AP-2524B_BG; AP-2524B_*	687 sq ft	444	389 kWh/yr	$71
24	LEVOIT	LAP-C601S-WUSR	611 sq ft	396	389 kWh/yr	$71
25	AirDoctor	AD4000	574 sq ft	381	396.2 kWh/yr	$73
26	Coway	Airmega 450S(W);Airmega 450S(BG);Airmega 450S(*);AP-2524C_WT;AP-2524C_BG; AP-2524C _*	687 sq ft	449	399 kWh/yr	$73
27	HealthWay	MAX500	640 sq ft	425	430 kWh/yr	$79
28	Intellipure	MAX500	640 sq ft	425	430 kWh/yr	$79

Estimated running cost = annual kWh × 18.31¢/kWh (July 2026 US average). Your own rate may be higher or lower — check your bill. ENERGY STAR figures are lab-test results; real-world use varies. This list includes discontinued and not-yet-sold certified models, and some brands are white-label relabels of the same unit.