How Much Does It Cost to Run a Central Air Conditioner?
A 3-ton central AC is one of the biggest summer loads in a home, pulling roughly 3,500 watts while the compressor runs. At the US-average rate of 16.5¢/kWh, running a central air conditioner costs about $105.27/month ($1,263.19/year) at typical use. Adjust the watts, hours, and your rate below for your exact number.
Cost to run a central air conditioner
$1,263/yr
- Per day
- $3.46
- Per month
- $105.27
- Energy per year
- 7,665 kWh
Cost = power (kW) × hours × days × your rate. Defaults are typical values — enter your appliance's actual watts (often on a label) and your real rate for a precise figure.
How much electricity does a central air conditioner use?
At 3,500 W for 6 hours a day, a central air conditioner uses about 21 kWh per day — roughly 639 kWh per month and 7,665 kWh per year. That's about 74% of the 863 kWh the average US home uses in a month. Energy use is the same everywhere — only the price per kWh changes your bill.
Wondering about the circuit instead? See how many amps a central air conditioner draws.
Cost to run a central air conditioner by electricity rate
Same 3,500 W appliance, 6 h/day — the bill changes with where you live.
| Scenario | Rate | Per month | Per year |
|---|---|---|---|
| Cheapest states (North Dakota) | 11.5¢ | $73.52 | $882.24 |
| US average | 16.5¢ | $105.27 | $1,263.19 |
| Most expensive (Hawaii) | 42.9¢ | $273.77 | $3,285.22 |
Find your state's rate on the electricity rates by state page, or see the appliance wattage chart for more devices.
Measure what a central air conditioner really costs you
The estimate above uses typical wattage and hours. This load is usually hardwired or on a 240 V circuit, so a plug-in meter won't fit it; a whole-home monitor's sensors clip onto the circuit's wires inside the panel and log its real kilowatt-hours. That means working in a live panel — hire an electrician if that isn't you.
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Whole-home energy monitor
Emporia Vue 3 Home Energy Monitor (16 circuit sensors)
Best for: Measuring hardwired and 240 V loads, or every circuit at once
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