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Cost to run a central air conditioner in Montana
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$0.54/hour
Central Air Conditioner at 3,500 W in Montana (15.57¢/kWh) · $132.53/month at 8 h/day
By hours of use
| Use | Per day | Per month | Per year |
|---|---|---|---|
| 1 h/day | $0.54 | $16.57 | $198.91 |
| 2 h/day | $1.09 | $33.13 | $397.81 |
| 4 h/day | $2.18 | $66.27 | $795.63 |
| 8 h/day | $4.36 | $132.53 | $1,591.25 |
| 12 h/day | $6.54 | $198.80 | $2,386.88 |
| 24 h/day | $13.08 | $397.60 | $4,773.76 |
A 3-ton central AC typically draws 3,000-4,000 W while running; SEER rating and duct losses matter.
Same appliance, nearby states
| State | ¢/kWh | Per month |
|---|---|---|
| Montana | 15.57 | $132.53 |
| Arizona | 15.05 | $128.11 |
| South Dakota | 15.15 | $128.96 |
| Kansas | 15.47 | $131.68 |
| South Carolina | 15.76 | $134.15 |
| Georgia | 15.90 | $135.34 |
| Texas | 15.91 | $135.43 |
FAQ
How much does it cost to run a central air conditioner in Montana?
At 3,500 W and 15.57¢/kWh: $0.54 per hour, $4.36 per day and $132.53 per month at 8 h/day.
How does Montana compare with other states?
The same use costs $108.27/month in Nevada (cheapest) and $401.60/month in Hawaii (most expensive); the US average is $154.58.
Price: EIA Electric Power Monthly, Table 5.6.A (residential, August 2026 preliminary; released October 23, 2026).
Central Air Conditioner cost calculator · Electricity cost in Montana
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