How much does it cost to run a central air conditioner?
About $99.50 a month on the typical usage below, at the U.S. average $0.1816/kWh. Set your own rate and usage and the figure updates instantly.
This is about the electricity cost of running central air, not the price to install a system — that's a separate one-time cost, usually $4,000–$12,000.
A whole-house AC compressor pulls roughly 3,000–5,000W while the cooling cycle is running (not 24/7).
Running a central air conditioner at 63 kWh of heat a day at a COP of 3.5 costs about
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Central air is usually the heavyweight on a summer electric bill. The outdoor compressor draws several thousand watts whenever it's actively cooling — but it doesn't run continuously. On a hot day it might cycle on for 6–9 hours' worth of run time spread across 24 hours, which is what this estimate is modelling.
Because the run time scales with how hard your house has to fight the outdoor heat, small changes to the thermostat and the building envelope move this number more than anything you can do to the unit itself.
What drives the cost of running a central air conditioner
- Cooling run time climbs fast as the gap between your thermostat and the outdoor temperature grows.
- An older or low-SEER unit does the same cooling for noticeably more watts.
- Leaky ducts, poor insulation and a clogged filter all make it run longer for the same comfort.
How to cut it
- Each degree warmer on the thermostat cuts run time by roughly 3–5% — 78°F costs far less than 72°F.
- A programmable or smart thermostat that eases off while you're out is the highest-value change.
- Replace the air filter on schedule and keep the outdoor coil clear so the compressor isn't fighting itself.
- Ceiling fans let you feel comfortable a couple of degrees warmer for ~65W instead of thousands.
Data basis
- Electricity price
- U.S. Energy Information Administration, Electric Power Monthly, Table 5.6.B, June 2026 year to date, released 2026-08-26. Retrieved 2026-09-11. Average residential revenue per kWh. A benchmark average, not a utility tariff — it excludes the fixed charges, tiers, time-of-use windows, taxes and fuel adjustments on a real bill.
- Appliance energy
- A representative running power for a central air conditioner, compiled from published manufacturer specifications and public appliance-energy guidance, and presented as a typical figure with the usual range shown above. It is not a measurement of your unit, and we do not claim a single primary source for it — the nameplate on your appliance, or an hour with a plug-in energy meter, beats any typical figure we can publish.
- Usage model
- Heat moved, not made — 63 kWh of heat a day at a COP of 3.5
- International prices
- rounded typical household tariffs for each market, in that market's own currency unless the row says US$ equivalent. These are planning benchmarks with no single primary source; enter the per-kWh price from your own bill for an accurate figure.
- Last reviewed
- 20 August 2026. Next scheduled review 20 February 2027.
- Corrections
- Think a figure is wrong? Tell us at corrections@watt-dollar.com and see our corrections policy.
What different sizes of central air conditioner draw
The typical figure above is a middle-of-the-road unit. Since a central air conditioner is sold by system size in tons, here's the running power to expect across the common sizes — set the wattage to match yours for an exact cost.
| System size | Typical running power | What it suits |
|---|---|---|
| 2-ton | 2,000W | small home or condo, ~1,000-1,200 sq ft |
| 3-ton | 3,000W | typical mid-size single-family home, ~1,500-1,800 sq ft |
| 4-ton | 4,000W | larger home, ~2,000-2,600 sq ft |
| 5-ton | 5,000W | big or multi-story whole house, ~2,600-3,200 sq ft |
Common questions
How much does it cost to run a central air conditioner per month?
On the assumption shown above — 63 kWh of heat a day at a COP of 3.5 — a central air conditioner costs about $99.50 a month, or $1,193 a year, at $0.1816/kWh. That price is the U.S. average; set your own rate and usage above and the figure updates.
How is that worked out?
Delivered heating or cooling per day, divided by the seasonal efficiency (COP). At 63 kWh of heat a day at a COP of 3.5 that is 18.00 kWh a day, which at $0.1816/kWh costs $3.27 a day.
How can I cut the cost of running a central air conditioner?
Each degree warmer on the thermostat cuts run time by roughly 3–5% — 78°F costs far less than 72°F. As a worked example: moving from a COP of 3.5 to 4.5 takes it from $1,193 to $928 a year, about $265 less.
Do I really pay that every year?
Only if you run it every day. Most people don't: over a typical 120-day cooling season the same usage comes to about $392. The annual figure assumes daily use all year.