Cost to run a central air conditioner
Heating & cooling · typical wattage 3,500 W (2,000 W-5,000 W)
A central air conditioner draws about 2,000 W-5,000 W (typically 3,500 W). Run 8 hours a day, it uses about 3,360 kWh/year, which costs roughly $51.97/month and $624/year at the US average residential rate of 18.56¢/kWh (March 2026). At a high-rate state like California (33.35¢) it costs more; at a low-rate state like Washington (14.40¢) it costs less.
Source: U.S. DOE — Estimating Appliance and Home Electronic Energy Use. Data as of June 2026.
Central air conditioner at a glance
| Figure | Central air conditioner |
|---|---|
| Typical running wattage | 3,500 W (2,000 W-5,000 W) |
| Assumed usage | 8 h/day, 120 days/yr |
| Energy used | 3,360 kWh per year |
| Cost per month @ 18.56¢ | $51.97 |
| Cost per year @ 18.56¢ | $624 |
Source: U.S. DOE — Estimating Appliance and Home Electronic Energy Use; ENERGY STAR product specifications. Data as of June 2026.
Cost at light, typical and heavy use
How the monthly and yearly cost changes with how long you run it, at the US average 18.56¢/kWh:
| Usage | Cost / month | Cost / year |
|---|---|---|
| Light use (4 h/day) | $77.95 | $948 |
| Typical use (8 h/day) | $156 | $1,897 |
| Heavy use (12 h/day) | $234 | $2,845 |
Cost at different state rates
The same central air conditioner at typical usage, priced at a few representative state rates:
| Rate | Cost / month | Cost / year |
|---|---|---|
| US average (18.56¢) | $51.97 | $624 |
| Washington (14.40¢) | $121 | $1,472 |
| Texas (16.39¢) | $138 | $1,675 |
| California (33.35¢) | $280 | $3,408 |
Source: EIA Electric Power Monthly, Table 5.6.A (residential) (March 2026). Data as of June 2026.
Use the calculator to price it at your exact rate, or see all 51 states.
Wattage source & how to save
A central AC compressor draws roughly 3,000–4,000 W (2–5 ton systems span 2,000–5,000 W). It cycles, so it is not at full power the whole time it is on.
Tip to cut the cost: Raise the thermostat a few degrees, change filters, and use a programmable schedule — cooling is one of the largest summer loads.
Frequently asked questions
How much does it cost to run a central air conditioner?
At the US average residential rate of 18.56¢/kWh, a central air conditioner (about 2,000 W-5,000 W, typically 3,500 W) used 8 hours a day costs roughly $51.97 per month and $624 per year. Your cost depends on your exact wattage, usage and local rate. Use the calculator for an exact figure.
How many watts does a central air conditioner use?
A central AC compressor draws roughly 3,000–4,000 W (2–5 ton systems span 2,000–5,000 W). It cycles, so it is not at full power the whole time it is on.
How much electricity does a central air conditioner use per year?
About 3,360 kWh per year at typical usage. That's 28.00 kWh per day at 8 hours of use.
How can I cut the running cost of a central air conditioner?
Raise the thermostat a few degrees, change filters, and use a programmable schedule — cooling is one of the largest summer loads.
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Sources & accuracy
Wattage: U.S. DOE — Estimating Appliance and Home Electronic Energy Use and ENERGY STAR-grade references (typical figures; ranges shown where relevant). Electricity rate: EIA Electric Power Monthly (March 2026). All public domain. Costs are a transparent calculation (see methodology) and are estimates only — your appliance's actual wattage, your usage and your utility rate may differ. Check the appliance label and your bill before relying on these figures.
Last updated: 2026-06-20