WattCost

Data through June 2026

Running cost · Air Purifiers · ENERGY STAR certified

Coway Airmega ProX

At the standardized usage ENERGY STAR assumes, the Coway Airmega ProX consumes 335 kWh a year — about $61 at the U.S. average electricity rate ($5.12 a month). Even among certified models it's on the thirsty end: 126% more electricity than the median air purifier, ranked 198 of 225. The same unit costs $44 a year in Nevada but $177 in Hawaii — electricity rates, not the appliance, make the difference. It also meets ENERGY STAR's stricter “Most Efficient” criteria. Note the certified pool here is small (225 models), so rankings shift more with each data refresh.

Estimated annual running cost · U.S. average rate 18.3¢/kWh

$61/yr

$5.50 · cheapest certified air purifiers$90 · priciest
Per month
$5.12
Per day
17¢
Certified use
335 kWh/yr
Rated room size
894 sq ft
CADR (smoke)
577
Technology
Fan and Filter
Efficiency
10.2 CFM/W
30 kWh490 kWh
Where the Coway Airmega ProX (▮) sits among all 225 certified air purifiers, by annual kWh

What it costs in every state

Coway Airmega ProX: 335 kWh/yr × each state's average residential rate (EIA)
StateRate ¢/kWhThis model $/yrRelative cost
Alabama16.4¢$55
Alaska28.2¢$95
Arizona15.2¢$51
Arkansas14.1¢$47
California34.7¢$116
Colorado17.1¢$57
Connecticut24.3¢$81
Delaware19.3¢$65
District of Columbia24.4¢$82
Florida15.1¢$51
Georgia16.4¢$55
Hawaiipriciest52.7¢$177
Idaho14.4¢$48
Illinois19.9¢$67
Indiana17.5¢$59
Iowa15.9¢$53
Kansas15.7¢$53
Kentucky14.3¢$48
Louisiana13.5¢$45
Maine29.6¢$99
Maryland21.8¢$73
Massachusetts29.6¢$99
Michigan23.0¢$77
Minnesota17.5¢$59
Mississippi14.9¢$50
Missouri16.2¢$54
Montana15.1¢$51
Nebraska13.3¢$44
Nevadacheapest13.1¢$44
New Hampshire27.0¢$90
New Jersey24.9¢$84
New Mexico15.1¢$50
New York29.5¢$99
North Carolina14.7¢$49
North Dakota14.1¢$47
Ohio19.2¢$64
Oklahoma14.3¢$48
Oregon16.3¢$55
Pennsylvania21.7¢$73
Rhode Island29.2¢$98
South Carolina15.6¢$52
South Dakota15.4¢$51
Tennessee14.1¢$47
Texas15.9¢$53
Utah13.4¢$45
Vermont24.4¢$82
Virginia17.2¢$58
Washington14.9¢$50
West Virginia15.4¢$52
Wisconsin19.6¢$66
Wyoming15.2¢$51

Certified models closest in efficiency

air purifiers within reach of 335 kWh/yr
ModelkWh/yr$/yr (US avg)
Coway Airmega Airmega ProX;AP-3522F_US;Airmega ProX(W);Airmega ProX(*);AP-3522F_WT;AP-3522F_most efficient335$61
Coway Airmega ProX;Airmega ProX(W);Airmega ProX(*);AP-3522F_US;AP-3522F_WT;AP-3522F_most efficient335$61
Blueair 6712211000336$62
Midea KJ600G-RX600A341$63
PURECODE PAR001341$63
Sharp KJ600F-LM1-SH341$63

Run your own numbers

Your rate, your numbers

Per day
17¢
Per month
$5.12
Per year
$61

335 kWh/yr × 18.3¢/kWh = $61/yr

Prefilled with this model's certified 335 kWh/yr — adjust if your usage differs from the DOE test basis. The certified annual kWh comes from the ENERGY STAR room air cleaner test basis, which assumes continuous daily operation. Running fewer hours costs proportionally less.

Questions, answered with the data

How much electricity does the Coway Airmega ProX use?
ENERGY STAR certifies the Coway Airmega ProX at 335 kWh per year. The certified annual kWh comes from the ENERGY STAR room air cleaner test basis, which assumes continuous daily operation. Running fewer hours costs proportionally less.
How much does the Coway Airmega ProX cost to run per month?
About $5.12 a month at the U.S. average residential rate (18.3¢/kWh) — 17¢ a day, or $61 a year. Your state's rate moves this up or down; see the table above.
Is the Coway Airmega ProX energy efficient?
It uses 126% more electricity than the median certified air purifier, which puts it among the least efficient certified models. It also meets ENERGY STAR's Most Efficient criteria.
What does the Coway Airmega ProX cost to run in the cheapest vs. priciest state?
At current residential rates it costs about $44 a year in Nevada (13.1¢/kWh) and $177 in Hawaii (52.7¢/kWh).

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