WattCost

Data through June 2026

Running cost · Air Purifiers · ENERGY STAR certified

SIESEAN AP-400

The SIESEAN AP-400's certified consumption is 243 kWh per year, which prices out to about $45 at the national average rate — your hours of use scale that directly. That's close to the middle of the certified pack — about 64% above the median air purifier, ranked 165 of 225. The same unit costs $32 a year in Nevada but $128 in Hawaii — electricity rates, not the appliance, make the difference. 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

$45/yr

$5.50 · cheapest certified air purifiers$90 · priciest
Per month
$3.71
Per day
12¢
Certified use
243 kWh/yr
Rated room size
357 sq ft
CADR (smoke)
230
Technology
Fan and Filter
Efficiency
5.6 CFM/W
30 kWh490 kWh
Where the SIESEAN AP-400 (▮) sits among all 225 certified air purifiers, by annual kWh

What it costs in every state

SIESEAN AP-400: 243 kWh/yr × each state's average residential rate (EIA)
StateRate ¢/kWhThis model $/yrRelative cost
Alabama16.4¢$40
Alaska28.2¢$69
Arizona15.2¢$37
Arkansas14.1¢$34
California34.7¢$84
Colorado17.1¢$42
Connecticut24.3¢$59
Delaware19.3¢$47
District of Columbia24.4¢$59
Florida15.1¢$37
Georgia16.4¢$40
Hawaiipriciest52.7¢$128
Idaho14.4¢$35
Illinois19.9¢$48
Indiana17.5¢$43
Iowa15.9¢$39
Kansas15.7¢$38
Kentucky14.3¢$35
Louisiana13.5¢$33
Maine29.6¢$72
Maryland21.8¢$53
Massachusetts29.6¢$72
Michigan23.0¢$56
Minnesota17.5¢$43
Mississippi14.9¢$36
Missouri16.2¢$39
Montana15.1¢$37
Nebraska13.3¢$32
Nevadacheapest13.1¢$32
New Hampshire27.0¢$66
New Jersey24.9¢$61
New Mexico15.1¢$37
New York29.5¢$72
North Carolina14.7¢$36
North Dakota14.1¢$34
Ohio19.2¢$47
Oklahoma14.3¢$35
Oregon16.3¢$40
Pennsylvania21.7¢$53
Rhode Island29.2¢$71
South Carolina15.6¢$38
South Dakota15.4¢$37
Tennessee14.1¢$34
Texas15.9¢$39
Utah13.4¢$32
Vermont24.4¢$59
Virginia17.2¢$42
Washington14.9¢$36
West Virginia15.4¢$38
Wisconsin19.6¢$48
Wyoming15.2¢$37

Certified models closest in efficiency

air purifiers within reach of 243 kWh/yr
ModelkWh/yr$/yr (US avg)
Amazon Basics AP5110-UL240$44
LEVOIT Core 400S237$43
Blueair 4312111000most efficient235$43
Coway AP-3018Bmost efficient235$43
LEVOIT LAP-C401S-WUSR235$43
Winix C610235$43

Run your own numbers

Your rate, your numbers

Per day
12¢
Per month
$3.71
Per year
$45

243 kWh/yr × 18.3¢/kWh = $45/yr

Prefilled with this model's certified 243 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 SIESEAN AP-400 use?
ENERGY STAR certifies the SIESEAN AP-400 at 243 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 SIESEAN AP-400 cost to run per month?
About $3.71 a month at the U.S. average residential rate (18.3¢/kWh) — 12¢ a day, or $45 a year. Your state's rate moves this up or down; see the table above.
Is the SIESEAN AP-400 energy efficient?
It uses 64% more electricity than the median certified air purifier.
What does the SIESEAN AP-400 cost to run in the cheapest vs. priciest state?
At current residential rates it costs about $32 a year in Nevada (13.1¢/kWh) and $128 in Hawaii (52.7¢/kWh).

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