hvac

Cost to run a central air conditioner

A typical 3-ton central AC pulls about 3,500 watts when running. In hot climates, AC runs 6–10 hours a day in summer and is by far the largest single line item on your bill.

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Your electric rate ($/kWh)

US average: $0.16/kWh. CA & HI: $0.30+. Look at any electric bill for your exact rate.

Hours used per day

Estimated cost

Wattage: 3500 W
kWh per hour: 3.500
Cost per hour: $0.56
Cost per day: $4.48
Cost per month: $134.40
Cost per year: $1635

Ways to lower the cost

•Set thermostat to 78°F when home and 82°F when away — every degree below 78 adds ~6% to AC cost.
•Replace filters every 3 months — clogged filters cost 5–15% more.
•Get a smart thermostat (Nest, ecobee) — many utilities give you one for free.
•Pre-cool to 75°F before peak hours if you're on a TOU plan.

Ceiling fans let you raise your AC 2–4°F — same comfort, lower bill

ENERGY STAR ceiling fans use ~75% less energy than older models and let you set your thermostat 2–4°F higher with the same perceived comfort. Big savings during cooling season.

Shop ceiling fans

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