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Cost to run a central air conditioner in Illinois
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$0.68/hour
Central Air Conditioner at 3,500 W in Illinois (19.32¢/kWh) · $164.45/month at 8 h/day
By hours of use
| Use | Per day | Per month | Per year |
|---|---|---|---|
| 1 h/day | $0.68 | $20.56 | $246.81 |
| 2 h/day | $1.35 | $41.11 | $493.63 |
| 4 h/day | $2.70 | $82.23 | $987.25 |
| 8 h/day | $5.41 | $164.45 | $1,974.50 |
| 12 h/day | $8.11 | $246.68 | $2,961.76 |
| 24 h/day | $16.23 | $493.36 | $5,923.51 |
A 3-ton central AC typically draws 3,000-4,000 W while running; SEER rating and duct losses matter.
Same appliance, nearby states
FAQ
How much does it cost to run a central air conditioner in Illinois?
At 3,500 W and 19.32¢/kWh: $0.68 per hour, $5.41 per day and $164.45 per month at 8 h/day.
How does Illinois compare with other states?
The same use costs $108.27/month in Nevada (cheapest) and $401.60/month in Hawaii (most expensive); the US average is $154.58.
Price: EIA Electric Power Monthly, Table 5.6.A (residential, August 2026 preliminary; released October 23, 2026).
Central Air Conditioner cost calculator · Electricity cost in Illinois
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