Cost to Run a Central Air Conditioner in Illinois
Illinois's average residential electricity rate is 23.9¢/kWh as of May 2026 — the 40th cheapest in the country, 30% above the U.S. average. At typical usage (8 hours/day), a central air conditioner here costs $203 per month.
Per hour
$0.84
at 2,000–5,000 W
Per day
$6.69
8 hours/day
Per month
$203
851 kWh
Per year
$2,443
10,220 kWh
By usage level in Illinois
| Usage | Per day | Per month | Per year |
|---|---|---|---|
| Light (4 hrs/day) | $3.35 | $102 | $1,221 |
| Typical (8 hrs/day) | $6.69 | $203 | $2,443 |
| Heavy (16 hrs/day) | $13.38 | $407 | $4,885 |
Illinois vs. the rest of the country
Monthly cost at typical usage.
Frequently asked questions
How much does it cost to run a central air conditioner in Illinois?
At Illinois's current average residential rate of 23.9¢/kWh (May 2026), a central air conditioner with typical usage costs about $6.69 per day, $203 per month, or $2,443 per year.
Is running a central air conditioner in Illinois more expensive than average?
Yes. Illinois's electricity costs about 30% more than the U.S. average, so the same usage costs $203 per month here versus $157 nationally.
What does electricity cost in Illinois right now?
Illinois residents pay an average of 23.9¢ per kWh as of May 2026 — the 40th cheapest rate of the 51 U.S. jurisdictions we track.