Is a central air conditioner expensive to run?

Raising the thermostat a few degrees and running the fan on 'auto' cuts AC runtime — the single biggest lever on a summer bill. At typical use it adds about $105.27 to a monthly electric bill at the US-average rate, but that swings from $73.52 in the cheapest states to $273.77 in the most expensive.

How many watts does a central air conditioner use?

Central Air Conditioner typically draws about 3,500 running watts. Because it has a motor or compressor, it briefly spikes to around 8,000 watts at startup, which matters for generator and breaker sizing but not for energy cost. Check the nameplate or label on your specific unit for its exact rating.

How can I lower the cost of running a central air conditioner?

Raising the thermostat a few degrees and running the fan on 'auto' cuts AC runtime — the single biggest lever on a summer bill. You can also cut the cost by lowering your electricity rate — many utilities offer cheaper off-peak hours — or simply by running it fewer hours. Use the calculator above to see how changing hours per day or your rate moves the number.

How Much Does It Cost to Run 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.

Power (watts)

Hours per day: 6

Days per week: 7

Your state (sets the rate)

Electricity rate ($/kWh)

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.

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.

Frequently asked questions

At the US-average residential rate of 16.5¢/kWh, a central air conditioner drawing 3,500 watts for about 6 hours a day costs roughly $3.46 per day, $105.27 per month, and $1,263.19 per year. Your actual cost depends on your electricity rate and how much you use it — adjust both in the calculator above.

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How Much Does It Cost to Run Central Air Conditioner?

Cost to run a central air conditioner by electricity rate

Frequently asked questions

How much does it cost to run a central air conditioner?

Is a central air conditioner expensive to run?

How many watts does a central air conditioner use?

How can I lower the cost of running a central air conditioner?

Cost to run other appliances