Data through June 2026
Running cost · Room Air Conditioners · ENERGY STAR certified
Century RXTS-81A
The Century RXTS-81A is certified at 400 kWh per year (based on 750 standardized hours), roughly $73 at the national average — though seasonal use means your real bill lands in a few months, not twelve. That's 25% less than the median certified room air conditioner, placing it comfortably in the efficient third of the field (62 of 439). Where you live moves the bill from $52 a year in Nevada to $211 in Hawaii.
Uses 38% less energy than the U.S. federal minimum
Dimensions 13.5" H × 19.2" W × 22" D, 53.1 lb
Estimated annual running cost · U.S. average rate 18.3¢/kWh
$73/yr
- Per month
- $6.11
- Per day
- 20¢
- Certified use
- 400 kWh/yr
- Cooling capacity
- 8,000 BTU/hr
- CEER
- 15
- Mounting
- Straddles Window
- Variable-speed compressor
- Yes
What it costs in every state
| State | Rate ¢/kWh | This model $/yr | Relative cost |
|---|---|---|---|
| Alabama | 16.4¢ | $66 | |
| Alaska | 28.2¢ | $113 | |
| Arizona | 15.2¢ | $61 | |
| Arkansas | 14.1¢ | $56 | |
| California | 34.7¢ | $139 | |
| Colorado | 17.1¢ | $69 | |
| Connecticut | 24.3¢ | $97 | |
| Delaware | 19.3¢ | $77 | |
| District of Columbia | 24.4¢ | $98 | |
| Florida | 15.1¢ | $60 | |
| Georgia | 16.4¢ | $65 | |
| Hawaiipriciest | 52.7¢ | $211 | |
| Idaho | 14.4¢ | $57 | |
| Illinois | 19.9¢ | $80 | |
| Indiana | 17.5¢ | $70 | |
| Iowa | 15.9¢ | $64 | |
| Kansas | 15.7¢ | $63 | |
| Kentucky | 14.3¢ | $57 | |
| Louisiana | 13.5¢ | $54 | |
| Maine | 29.6¢ | $118 | |
| Maryland | 21.8¢ | $87 | |
| Massachusetts | 29.6¢ | $118 | |
| Michigan | 23.0¢ | $92 | |
| Minnesota | 17.5¢ | $70 | |
| Mississippi | 14.9¢ | $60 | |
| Missouri | 16.2¢ | $65 | |
| Montana | 15.1¢ | $61 | |
| Nebraska | 13.3¢ | $53 | |
| Nevadacheapest | 13.1¢ | $52 | |
| New Hampshire | 27.0¢ | $108 | |
| New Jersey | 24.9¢ | $100 | |
| New Mexico | 15.1¢ | $60 | |
| New York | 29.5¢ | $118 | |
| North Carolina | 14.7¢ | $59 | |
| North Dakota | 14.1¢ | $56 | |
| Ohio | 19.2¢ | $77 | |
| Oklahoma | 14.3¢ | $57 | |
| Oregon | 16.3¢ | $65 | |
| Pennsylvania | 21.7¢ | $87 | |
| Rhode Island | 29.2¢ | $117 | |
| South Carolina | 15.6¢ | $62 | |
| South Dakota | 15.4¢ | $61 | |
| Tennessee | 14.1¢ | $56 | |
| Texas | 15.9¢ | $64 | |
| Utah | 13.4¢ | $53 | |
| Vermont | 24.4¢ | $98 | |
| Virginia | 17.2¢ | $69 | |
| Washington | 14.9¢ | $60 | |
| West Virginia | 15.4¢ | $62 | |
| Wisconsin | 19.6¢ | $78 | |
| Wyoming | 15.2¢ | $61 |
Certified models closest in efficiency
| Model | kWh/yr | $/yr (US avg) |
|---|---|---|
| BLACK+DECKER BD08NWES | 400 | $73 |
| Comfort Aire RXTS-81A | 400 | $73 |
| Danby DAC080B7IWDB-6 | 400 | $73 |
| Danby DAC080B8IWDB-6 | 400 | $73 |
| Danby DAC080EBIBDB | 400 | $73 |
| DELLA 048-TL-W8KI | 400 | $73 |
Run your own numbers
Your rate, your numbers
- Per day
- 20¢
- Per month
- $6.11
- Per year
- $73
400 kWh/yr × 18.3¢/kWh = $73/yr
Prefilled with this model's certified 400 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 Century RXTS-81A use?
- ENERGY STAR certifies the Century RXTS-81A at 400 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 Century RXTS-81A cost to run per month?
- About $6.11 a month at the U.S. average residential rate (18.3¢/kWh) — 20¢ a day, or $73 a year. Your state's rate moves this up or down; see the table above.
- Is the Century RXTS-81A energy efficient?
- It uses 25% less electricity than the median certified room air conditioner, placing it in the efficient third of certified models.
- What does the Century RXTS-81A cost to run in the cheapest vs. priciest state?
- At current residential rates it costs about $52 a year in Nevada (13.1¢/kWh) and $211 in Hawaii (52.7¢/kWh).