Cost to Run a Window Air Conditioner in Montana
Montana's average residential electricity rate is 15¢/kWh as of July 2026 — the 15th cheapest in the country, 18% below the U.S. average. At typical usage (8 hours/day), a window air conditioner here costs $32.83 per month.
Per hour
$0.14
at 500–1,500 W
Per day
$1.08
8 hours/day
Per month
$32.83
219 kWh
Per year
$394
2,628 kWh
By usage level in Montana
| Usage | Per day | Per month | Per year |
|---|---|---|---|
| Light (4 hrs/day) | $0.54 | $16.42 | $197 |
| Typical (8 hrs/day) | $1.08 | $32.83 | $394 |
| Heavy (16 hrs/day) | $2.16 | $65.66 | $788 |
Montana vs. the rest of the country
Monthly cost at typical usage.
Frequently asked questions
How much does it cost to run a window air conditioner in Montana?
At Montana's current average residential rate of 15¢/kWh (July 2026), a window air conditioner with typical usage costs about $1.08 per day, $32.83 per month, or $394 per year.
Is running a window air conditioner in Montana more expensive than average?
No — it's cheaper. Montana's rate is about 18% below the U.S. average: $32.83 per month here versus $40.06 nationally.
What does electricity cost in Montana right now?
Montana residents pay an average of 15¢ per kWh as of July 2026 — the 15th cheapest rate of the 51 U.S. jurisdictions we track.