Keystone KSTAW182WA

ENERGY STAR certified

Window air conditioner · 18000 BTU/hr

InYour statethis room air conditioner costs

about $14 a month

$162 a year

An estimate at your state's average rate — not a guarantee of your bill.

Estimated yearly cost

$126

a year

The yellow sticker says $126 a year.

You'll pay $36 more.

Sticker uses 14¢ per kWh. The U.S. average is 18.0¢ per kWh.

Energy use

900 kWh a year

vs similar window air conditioner

+53%

Cheaper room air conditioners, same size

ENERGY STAR lists 7 other certified models at the same 900 kWh a year, size and type, so everything on this page applies to them too.

Cheaper to run, same size

A year at the U.S. average residential rate.

Compare all 58 room air conditioners over 18,000 BTU

Cost in every state

900 kWh a year × each state's average residential rate (EIA 12-month average through July 2026).

State	Rate	Per year	Per month
Hawaii	43.7¢	$393	about $33 a month
California	33.1¢	$298	about $25 a month
Massachusetts	30.4¢	$274	about $23 a month
Rhode Island	29.4¢	$265	about $22 a month
Maine	29.3¢	$264	about $22 a month
New York	28.4¢	$255	about $21 a month
Connecticut	28.2¢	$254	about $21 a month
Alaska	27.0¢	$243	about $20 a month
New Hampshire	26.8¢	$241	about $20 a month
District of Columbia	24.2¢	$218	about $18 a month

Show all 52 states

Vermont	23.9¢	$215	about $18 a month
New Jersey	23.6¢	$212	about $18 a month
Maryland	22.3¢	$201	about $17 a month
Michigan	21.0¢	$189	about $16 a month
Pennsylvania	20.8¢	$187	about $16 a month
Illinois	19.0¢	$171	about $14 a month
Wisconsin	18.8¢	$169	about $14 a month
Ohio	18.3¢	$165	about $14 a month
U.S. average	18.0¢	$162	about $14 a month
Delaware	18.0¢	$162	about $13 a month
Indiana	17.1¢	$154	about $13 a month
Virginia	16.6¢	$149	about $12 a month
Colorado	16.6¢	$149	about $12 a month
Alabama	16.5¢	$148	about $12 a month
Minnesota	16.2¢	$146	about $12 a month
Texas	16.0¢	$144	about $12 a month
South Carolina	15.7¢	$141	about $12 a month
West Virginia	15.7¢	$141	about $12 a month
Oregon	15.6¢	$140	about $12 a month
Arizona	15.5¢	$139	about $12 a month
Florida	15.4¢	$139	about $12 a month
New Mexico	15.2¢	$137	about $11 a month
Kansas	15.1¢	$136	about $11 a month
Georgia	15.1¢	$136	about $11 a month
Mississippi	14.9¢	$134	about $11 a month
North Carolina	14.9¢	$134	about $11 a month
South Dakota	14.3¢	$128	about $11 a month
Washington	14.2¢	$127	about $11 a month
Wyoming	14.2¢	$127	about $11 a month
Iowa	14.1¢	$127	about $11 a month
Kentucky	14.0¢	$126	about $10 a month
Montana	13.9¢	$125	about $10 a month
Missouri	13.9¢	$125	about $10 a month
Tennessee	13.7¢	$123	about $10 a month
Oklahoma	13.6¢	$123	about $10 a month
Nevada	13.6¢	$122	about $10 a month
Arkansas	13.5¢	$121	about $10 a month
Utah	13.3¢	$120	about $10 a month
Louisiana	13.1¢	$118	about $10 a month
Nebraska	12.9¢	$116	about $10 a month
Idaho	12.7¢	$114	about $10 a month
North Dakota	12.5¢	$113	about $9 a month

What the Keystone KSTAW182WA costs where electricity is expensive

At Hawaii's average residential rate of 43.7¢ per kWh, the Keystone KSTAW182WA costs $393 a year — $267 more a year than the label says. The EnergyGuide label estimates $126 a year, because every label in the country is calculated at 14¢ per kWh. At the U.S. average of 18.0¢ per kWh this room air conditioner costs $162 a year, and in North Dakota, the cheapest state, $113 a year.

Estimated annual running cost for the Keystone KSTAW182WA in the highest-rate states and the lowest-rate state
Where	Rate	Cost a year	vs the label
Hawaii	43.7¢ per kWh	$393	+$267
California	33.1¢ per kWh	$298	+$172
Massachusetts	30.4¢ per kWh	$274	+$148
Rhode Island	29.4¢ per kWh	$265	+$139
Maine	29.3¢ per kWh	$264	+$138
North Dakota	12.5¢ per kWh	$113	−$13

Electricity prices: EIA 12-month average through July 2026, residential sector, average revenue per kWh. Label figure calculated at 14¢ per kWh, the rate the FTC requires on labels.

Full specs

At the U.S. average residential rate this one costs $162 a year — about 53% more expensive to run than the average window air conditioner ($106 a year across 443 certified models).

$162

Most efficient $47Average $106Least efficient $378

Every model on this scale is ENERGY STAR certified. Range across 443 window air conditioners, priced a year at the U.S. average residential rate.

Brand: Keystone
Model number: KSTAW182WA
Type: Window air conditioner
Capacity: 18000 BTU/hr
Annual energy use: 900 kWh a year
Combined Energy Factor (CEF): 15
Better than the federal standard: 40% less energy
ENERGY STAR Most Efficient: No
On the market since: November 2024
Certified: November 2024
UPC: 840148729797
Cooling capacity (BTU/hr): 18000
CEER: 15
Mounting: Does Not Straddle Window or Windowsill
Variable-speed compressor: Yes
Heating mode: No
Voltage: 230
Width (in): 23.6
Height (in): 17.9
Depth (in): 25.4

Where to buy

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Common questions

+How much does the Keystone KSTAW182WA cost to run per month?

about $14 a month at the U.S. average residential rate of 18.0¢ per kWh, or $162 a year. Your cost depends on your state's rate — see the table above.

+How many kWh does the Keystone KSTAW182WA use?

900 kWh a year, as the manufacturer filed it with the EPA, in the ENERGY STAR certified product database.

+Is the Keystone KSTAW182WA energy efficient?

It is listed as ENERGY STAR certified. It uses about 53% more electricity than the average window air conditioner (average: 589 kWh a year).

+How does the Keystone KSTAW182WA compare to the average room air conditioner?

The average window air conditioner in our database uses 589 kWh a year, costing $106 a year at the U.S. average residential rate. The Keystone KSTAW182WA uses 900 kWh a year, costing $162 a year.

How we calculate this

Annual energy use (900 kWh a year) is the figure the manufacturer filed for this model with the EPA, in the ENERGY STAR certified product database. Running cost is that figure multiplied by a state's average residential electricity price from the U.S. Energy Information Administration (12-month average through July 2026, average revenue per kWh).

The annual figure for a room air conditioner assumes 750 hours of cooling a year, per the DOE test procedure (10 CFR 430 Subpart B, Appendix F, §5.2.1). Full methodology.

Sources: EPA ENERGY STAR certified product data, updated weekly · U.S. EIA electricity prices, 12-month average through July 2026.