Cost to run a window air conditioner in Illinois

$0.17/hour

Window Air Conditioner at 900 W in Illinois (19.32¢/kWh) · $42.29/month at 8 h/day

By hours of use

Use	Per day	Per month	Per year
1 h/day	$0.17	$5.29	$63.47
2 h/day	$0.35	$10.57	$126.93
4 h/day	$0.70	$21.14	$253.86
8 h/day	$1.39	$42.29	$507.73
12 h/day	$2.09	$63.43	$761.59
24 h/day	$4.17	$126.86	$1,523.19

A 8,000-10,000 BTU window unit draws roughly 700-1,000 W while the compressor runs.

How much does it cost to run a window air conditioner in Illinois?

At 900 W and 19.32¢/kWh: $0.17 per hour, $1.39 per day and $42.29 per month at 8 h/day.

How does Illinois compare with other states?

The same use costs $27.84/month in Nevada (cheapest) and $103.27/month in Hawaii (most expensive); the US average is $39.75.

Price: EIA Electric Power Monthly, Table 5.6.A (residential, August 2026 preliminary; released October 23, 2026).

Free calculator by KWhCalc