WattCost

Data through April 2026

Running cost · Room Air Conditioners · ENERGY STAR certified

Wallmaster WCVT12B30B

Under the DOE test basis of 750 hours a year, the Wallmaster WCVT12B30B draws 637 kWh — about $120 at the U.S. average rate, concentrated in the months you actually run it. That's close to the middle of the certified pack — about 20% above the median room air conditioner, ranked 288 of 396. The same unit costs $79 a year in North Dakota but $297 in Hawaii — electricity rates, not the appliance, make the difference. It also meets ENERGY STAR's stricter “Most Efficient” criteria.

Estimated annual running cost · U.S. average rate 18.8¢/kWh

$120/yr

$52 · cheapest certified room air conditioners$395 · priciest
Per month
$9.99
Per day
33¢
Certified use
637 kWh/yr
Cooling capacity
11,800 BTU/hr
CEER
13.9
Mounting
Does Not Straddle Window or Windowsill
Variable-speed compressor
Yes
274 kWh2,096 kWh
Where the Wallmaster WCVT12B30B (▮) sits among all 396 certified room air conditioners, by annual kWh

What it costs in every state

Wallmaster WCVT12B30B: 637 kWh/yr × each state's average residential rate (EIA)
StateRate ¢/kWhThis model $/yrRelative cost
Alabama17.4¢$111
Alaska27.4¢$174
Arizona15.5¢$99
Arkansas14.2¢$90
California35.3¢$224
Colorado16.5¢$105
Connecticut32.2¢$205
Delaware18.8¢$120
District of Columbia25.4¢$162
Florida15.4¢$98
Georgia15.4¢$98
Hawaiipriciest46.6¢$297
Idaho12.7¢$81
Illinois20.5¢$130
Indiana17.9¢$114
Iowa13.9¢$88
Kansas15.8¢$100
Kentucky15.0¢$96
Louisiana14.4¢$92
Maine28.4¢$181
Maryland22.1¢$141
Massachusetts29.4¢$188
Michigan21.4¢$136
Minnesota16.4¢$104
Mississippi16.8¢$107
Missouri14.0¢$89
Montana13.9¢$89
Nebraska13.3¢$85
Nevada14.3¢$91
New Hampshire27.2¢$173
New Jersey23.5¢$150
New Mexico15.2¢$96
New York29.4¢$188
North Carolina16.3¢$103
North Dakotacheapest12.3¢$79
Ohio19.5¢$124
Oklahoma13.3¢$85
Oregon15.8¢$100
Pennsylvania21.5¢$137
Rhode Island28.3¢$180
South Carolina17.1¢$109
South Dakota14.5¢$92
Tennessee14.9¢$95
Texas17.0¢$108
Utah13.3¢$85
Vermont24.6¢$156
Virginia17.4¢$111
Washington14.4¢$91
West Virginia16.1¢$102
Wisconsin19.2¢$122
Wyoming14.7¢$93

Certified models closest in efficiency

room air conditioners within reach of 637 kWh/yr
ModelkWh/yr$/yr (US avg)
Friedrich KCVS12B30A635$120
Friedrich WCVT10B10A635$119
Friedrich WCVT10B30A640$121
Midea MAT12R1FWTKmost efficient648$122
Midea MAT12R1SWTKmost efficient648$122
Midea MAT12R2FWTKmost efficient648$122

Run your own numbers

Your rate, your numbers

Per day
33¢
Per month
$10.00
Per year
$120

637 kWh/yr × 18.8¢/kWh = $120/yr

Prefilled with this model's certified 637 kWh/yr — adjust if your usage differs from the DOE test basis. The certified annual kWh assumes 750 cooling hours per year (the DOE standard). In hot climates real usage can run well above that; in mild ones, below.

Questions, answered with the data

How much electricity does the Wallmaster WCVT12B30B use?
ENERGY STAR certifies the Wallmaster WCVT12B30B at 637 kWh per year. The certified annual kWh assumes 750 cooling hours per year (the DOE standard). In hot climates real usage can run well above that; in mild ones, below.
How much does the Wallmaster WCVT12B30B cost to run per month?
About $9.99 a month at the U.S. average residential rate (18.8¢/kWh) — 33¢ a day, or $120 a year. Your state's rate moves this up or down; see the table above.
Is the Wallmaster WCVT12B30B energy efficient?
It uses 20% more electricity than the median certified room air conditioner. It also meets ENERGY STAR's Most Efficient criteria.
What does the Wallmaster WCVT12B30B cost to run in the cheapest vs. priciest state?
At current residential rates it costs about $79 a year in North Dakota (12.3¢/kWh) and $297 in Hawaii (46.6¢/kWh).

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