Cost to Run a Window Air Conditioner in Montana
Montana's average residential electricity rate is 13.9¢/kWh as of April 2026 — the 7th cheapest in the country, 26% below the U.S. average. At typical usage (8 hours/day), a window air conditioner here costs $30.42 per month.
Per hour
$0.13
at 500–1,500 W
Per day
$1.00
8 hours/day
Per month
$30.42
219 kWh
Per year
$365
2,628 kWh
By usage level in Montana
| Usage | Per day | Per month | Per year |
|---|---|---|---|
| Light (4 hrs/day) | $0.50 | $15.21 | $183 |
| Typical (8 hrs/day) | $1.00 | $30.42 | $365 |
| Heavy (16 hrs/day) | $2.00 | $60.85 | $731 |
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 13.9¢/kWh (April 2026), a window air conditioner with typical usage costs about $1.00 per day, $30.42 per month, or $365 per year.
Is running a window air conditioner in Montana more expensive than average?
No — it's cheaper. Montana's rate is about 26% below the U.S. average: $30.42 per month here versus $41.15 nationally.
What does electricity cost in Montana right now?
Montana residents pay an average of 13.9¢ per kWh as of April 2026 — the 7th cheapest rate of the 51 U.S. jurisdictions we track.