WattCost

Data through June 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 $117 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 321 of 439. The same unit costs $83 a year in Nevada but $336 in Hawaii — electricity rates, not the appliance, make the difference. It also meets ENERGY STAR's stricter “Most Efficient” criteria.

Uses 46% less energy than the U.S. federal minimum

Dimensions 15.8" H × 26.5" W × 21" D, 110 lb

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

$117/yr

$48 · cheapest certified room air conditioners$384 · priciest
Per month
$9.73
Per day
32¢
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
260 kWh2,096 kWh
Where the Wallmaster WCVT12B30B (▮) sits among all 439 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
Alabama16.4¢$104
Alaska28.2¢$180
Arizona15.2¢$97
Arkansas14.1¢$90
California34.7¢$221
Colorado17.1¢$109
Connecticut24.3¢$155
Delaware19.3¢$123
District of Columbia24.4¢$155
Florida15.1¢$96
Georgia16.4¢$104
Hawaiipriciest52.7¢$336
Idaho14.4¢$91
Illinois19.9¢$127
Indiana17.5¢$111
Iowa15.9¢$101
Kansas15.7¢$100
Kentucky14.3¢$91
Louisiana13.5¢$86
Maine29.6¢$188
Maryland21.8¢$139
Massachusetts29.6¢$189
Michigan23.0¢$146
Minnesota17.5¢$112
Mississippi14.9¢$95
Missouri16.2¢$103
Montana15.1¢$96
Nebraska13.3¢$84
Nevadacheapest13.1¢$83
New Hampshire27.0¢$172
New Jersey24.9¢$159
New Mexico15.1¢$96
New York29.5¢$188
North Carolina14.7¢$94
North Dakota14.1¢$90
Ohio19.2¢$122
Oklahoma14.3¢$91
Oregon16.3¢$104
Pennsylvania21.7¢$138
Rhode Island29.2¢$186
South Carolina15.6¢$99
South Dakota15.4¢$98
Tennessee14.1¢$90
Texas15.9¢$101
Utah13.4¢$85
Vermont24.4¢$156
Virginia17.2¢$110
Washington14.9¢$95
West Virginia15.4¢$98
Wisconsin19.6¢$125
Wyoming15.2¢$97

Certified models closest in efficiency

room air conditioners within reach of 637 kWh/yr
ModelkWh/yr$/yr (US avg)
Friedrich KCVS12B30A635$116
Friedrich WCVT10B10A635$116
Friedrich WCVT10B30A640$117
Brothers 102396most efficient648$119
Brothers 102398most efficient648$119
Midea MAT12R1FWTKmost efficient648$119

Run your own numbers

Your rate, your numbers

Per day
32¢
Per month
$9.74
Per year
$117

637 kWh/yr × 18.3¢/kWh = $117/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 $9.73 a month at the U.S. average residential rate (18.3¢/kWh) — 32¢ a day, or $117 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 $83 a year in Nevada (13.1¢/kWh) and $336 in Hawaii (52.7¢/kWh).

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