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How much does it cost to run a portable air conditioner?
At the U.S. average residential price of 18.16¢ per kilowatt-hour (August 2026), running a portable air conditioner costs about $153 a year. Your own bill depends on your state's rate, which ranges from 12.72¢ to 47.18¢ across the country.
- Per hour
- 16.0¢
- Per day of use
- $1.28
- Per month
- $12.78
- Per year
- $153
Assumption: 1,100 W at a 80% duty cycle, 8 hours a day, 120 days a year — 845 kWh a year. Single-hose portables push conditioned air out of the room and pull unconditioned air in through every crack to replace it, so real-world runtime is longer than the spec sheet implies.
Cost by state
Same appliance, same usage, 51 different prices. Sorted cheapest first.
| State | Rate | Per month | Per year |
|---|---|---|---|
| Nevada | 12.72¢ | $8.95 | $107 |
| Louisiana | 12.87¢ | $9.06 | $109 |
| North Dakota | 13.31¢ | $9.37 | $112 |
| Utah | 13.31¢ | $9.37 | $112 |
| Idaho | 13.37¢ | $9.41 | $113 |
| Tennessee | 13.42¢ | $9.45 | $113 |
| Nebraska | 13.54¢ | $9.53 | $114 |
| Kentucky | 13.80¢ | $9.72 | $117 |
| Arkansas | 14.37¢ | $10.12 | $121 |
| Mississippi | 14.43¢ | $10.16 | $122 |
| Wyoming | 14.43¢ | $10.16 | $122 |
| Washington | 14.63¢ | $10.30 | $124 |
| Oklahoma | 14.82¢ | $10.43 | $125 |
| North Carolina | 14.95¢ | $10.52 | $126 |
| Florida | 14.99¢ | $10.55 | $127 |
| Arizona | 15.05¢ | $10.60 | $127 |
| South Dakota | 15.15¢ | $10.67 | $128 |
| Kansas | 15.47¢ | $10.89 | $131 |
| Montana | 15.57¢ | $10.96 | $132 |
| South Carolina | 15.76¢ | $11.10 | $133 |
| Georgia | 15.90¢ | $11.19 | $134 |
| Texas | 15.91¢ | $11.20 | $134 |
| Oregon | 15.92¢ | $11.21 | $134 |
| Missouri | 16.02¢ | $11.28 | $135 |
| West Virginia | 16.31¢ | $11.48 | $138 |
| Alabama | 16.33¢ | $11.50 | $138 |
| New Mexico | 16.51¢ | $11.62 | $139 |
| Indiana | 17.02¢ | $11.98 | $144 |
| Iowa | 17.06¢ | $12.01 | $144 |
| Colorado | 17.17¢ | $12.09 | $145 |
| Minnesota | 17.20¢ | $12.11 | $145 |
| Virginia | 17.64¢ | $12.42 | $149 |
| Delaware | 18.70¢ | $13.16 | $158 |
| Illinois | 19.32¢ | $13.60 | $163 |
| Ohio | 19.38¢ | $13.64 | $164 |
| Wisconsin | 19.41¢ | $13.66 | $164 |
| Maryland | 21.40¢ | $15.07 | $181 |
| Pennsylvania | 21.77¢ | $15.33 | $184 |
| Michigan | 22.99¢ | $16.18 | $194 |
| Vermont | 23.84¢ | $16.78 | $201 |
| Connecticut | 24.51¢ | $17.26 | $207 |
| New Jersey | 24.61¢ | $17.33 | $208 |
| District of Columbia | 25.98¢ | $18.29 | $219 |
| New Hampshire | 27.64¢ | $19.46 | $234 |
| Rhode Island | 28.18¢ | $19.84 | $238 |
| New York | 28.65¢ | $20.17 | $242 |
| Alaska | 29.41¢ | $20.70 | $248 |
| California | 29.75¢ | $20.94 | $251 |
| Massachusetts | 30.48¢ | $21.46 | $257 |
| Maine | 32.11¢ | $22.61 | $271 |
| Hawaii | 47.18¢ | $33.21 | $399 |
Cutting the number down
- A dual-hose model draws outdoor air for condenser cooling instead of depressurizing your room. It is the biggest efficiency difference in this category.
- Insulating the exhaust hose keeps rejected heat from radiating straight back into the room you just cooled.
- For the same BTU rating, a window unit almost always costs less to run than a portable.
Questions
- How many watts does a portable air conditioner use?
- About 1,100 W while running, though it cycles on and off, so average draw is 880 W.
- How much does a portable air conditioner cost per month?
- About $12.78 a month at the U.S. average rate, or $153 a year.
- Where is it cheapest to run?
- Nevada, at $107 a year, versus $399 in Hawaii — a spread of $291.