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Cost to run a window air conditioner in Montana
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$0.14/hour
Window Air Conditioner at 900 W in Montana (15.57¢/kWh) · $34.08/month at 8 h/day
By hours of use
| Use | Per day | Per month | Per year |
|---|---|---|---|
| 1 h/day | $0.14 | $4.26 | $51.15 |
| 2 h/day | $0.28 | $8.52 | $102.29 |
| 4 h/day | $0.56 | $17.04 | $204.59 |
| 8 h/day | $1.12 | $34.08 | $409.18 |
| 12 h/day | $1.68 | $51.12 | $613.77 |
| 24 h/day | $3.36 | $102.24 | $1,227.54 |
A 8,000-10,000 BTU window unit draws roughly 700-1,000 W while the compressor runs.
Same appliance, nearby states
| State | ¢/kWh | Per month |
|---|---|---|
| Montana | 15.57 | $34.08 |
| Arizona | 15.05 | $32.94 |
| South Dakota | 15.15 | $33.16 |
| Kansas | 15.47 | $33.86 |
| South Carolina | 15.76 | $34.50 |
| Georgia | 15.90 | $34.80 |
| Texas | 15.91 | $34.82 |
FAQ
How much does it cost to run a window air conditioner in Montana?
At 900 W and 15.57¢/kWh: $0.14 per hour, $1.12 per day and $34.08 per month at 8 h/day.
How does Montana compare with other states?
The same use costs $27.84/month in Nevada (cheapest) and $103.27/month in Hawaii (most expensive); the US average is $39.75.
Price: EIA Electric Power Monthly, Table 5.6.A (residential, August 2026 preliminary; released October 23, 2026).
Window Air Conditioner cost calculator · Electricity cost in Montana
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