Cost to run a window ac unit
Short answer
Running a window ac unit (~900W, ~8 hrs/day) costs about $1.21/day, $37/month, or $442/year at the U.S. average of 16.8¢/kWh.
Wattage
900 W
Per day
$1.21
Per month
$37
Per year
$442
Figures assume ~900W for ~8 hours a day at the U.S. average 16.8¢/kWh. Your state's rate and your real usage change the total — enter both in the calculator.
Your rate & usage
Open the cost calculatorOther appliances
Frequently asked questions
How much does it cost to run a window ac unit?
About $1.21 per day, $37 per month, or $442 per year at the U.S. average of 16.8¢/kWh, assuming ~900W for ~8 hours a day.
How many watts does a window ac unit use?
A typical window ac unit draws about 900 watts when running. Your model may differ — check its label or a plug-in power meter and enter the real number in the calculator.
How can I cut the cost of running a window ac unit?
Run it less, use a more efficient model, and check whether your utility offers cheaper off-peak (time-of-use) rates. Costs also vary 4× by state, so your local rate matters a lot.