Cost to Run a Portable Air Conditioner in Montana
Montana's average residential electricity rate is 14.7¢/kWh as of May 2026 — the 13th cheapest in the country, 20% below the U.S. average. At typical usage (8 hours/day), a portable air conditioner here costs $35.75 per month.
Per hour
$0.15
at 700–1,500 W
Per day
$1.18
8 hours/day
Per month
$35.75
243 kWh
Per year
$429
2,920 kWh
By usage level in Montana
| Usage | Per day | Per month | Per year |
|---|---|---|---|
| Light (4 hrs/day) | $0.59 | $17.88 | $215 |
| Typical (8 hrs/day) | $1.18 | $35.75 | $429 |
| Heavy (16 hrs/day) | $2.35 | $71.50 | $858 |
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 14.7¢/kWh (May 2026), a portable air conditioner with typical usage costs about $1.18 per day, $35.75 per month, or $429 per year.
Is running a portable air conditioner in Montana more expensive than average?
No — it's cheaper. Montana's rate is about 20% below the U.S. average: $35.75 per month here versus $44.75 nationally.
What does electricity cost in Montana right now?
Montana residents pay an average of 14.7¢ per kWh as of May 2026 — the 13th cheapest rate of the 51 U.S. jurisdictions we track.