Cost to Run a Portable 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 portable air conditioner here costs $36.48 per month.
Per hour
$0.15
at 700–1,500 W
Per day
$1.20
8 hours/day
Per month
$36.48
243 kWh
Per year
$438
2,920 kWh
By usage level in Montana
| Usage | Per day | Per month | Per year |
|---|---|---|---|
| Light (4 hrs/day) | $0.60 | $18.24 | $219 |
| Typical (8 hrs/day) | $1.20 | $36.48 | $438 |
| Heavy (16 hrs/day) | $2.40 | $72.96 | $876 |
Montana vs. the rest of the country
Monthly cost at typical usage.
Frequently asked questions
How much does it cost to run a portable air conditioner in Montana?
At Montana's current average residential rate of 15¢/kWh (July 2026), a portable air conditioner with typical usage costs about $1.20 per day, $36.48 per month, or $438 per year.
Is running a portable air conditioner in Montana more expensive than average?
No — it's cheaper. Montana's rate is about 18% below the U.S. average: $36.48 per month here versus $44.51 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.