Cost to Run a Evaporative (Swamp) Cooler in Missouri
Missouri's average residential electricity rate is 14¢/kWh as of April 2026 — the 8th cheapest in the country, 26% below the U.S. average. At typical usage (8 hours/day), a evaporative (swamp) cooler here costs $13.62 per month.
Per hour
5.6¢
at 100–800 W
Per day
$0.45
8 hours/day
Per month
$13.62
97 kWh
Per year
$164
1,168 kWh
By usage level in Missouri
| Usage | Per day | Per month | Per year |
|---|---|---|---|
| Light (4 hrs/day) | $0.22 | $6.81 | $81.76 |
| Typical (8 hrs/day) | $0.45 | $13.62 | $164 |
| Heavy (16 hrs/day) | $0.90 | $27.24 | $327 |
Missouri vs. the rest of the country
Monthly cost at typical usage.
Frequently asked questions
How much does it cost to run a evaporative (swamp) cooler in Missouri?
At Missouri's current average residential rate of 14¢/kWh (April 2026), a evaporative (swamp) cooler with typical usage costs about $0.45 per day, $13.62 per month, or $164 per year.
Is running a evaporative (swamp) cooler in Missouri more expensive than average?
No — it's cheaper. Missouri's rate is about 26% below the U.S. average: $13.62 per month here versus $18.29 nationally.
What does electricity cost in Missouri right now?
Missouri residents pay an average of 14¢ per kWh as of April 2026 — the 8th cheapest rate of the 51 U.S. jurisdictions we track.