U.S. residential electricity EIA data: July 2026 US average 18.3¢/kWh Updated
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Cooling · Connecticut

How Much Does It Cost to Run a Central Air Conditioner in Connecticut?

The short answer

Running a 3,500W central air conditioner in Connecticut costs about $0.85 an hour. At 8 hours a day, that’s roughly $206 a month and $2,469 a year.

The estimate uses Connecticut’s average residential electricity price of 24.2¢/kWh from EIA (July 2026) — 32% above the national average.

Source: U.S. EIA, July 2026 data · Updated

Central Air Conditioner cost by daily use in Connecticut

Cost at 24.2¢/kWh, the Connecticut average (EIA, Jul 2026)
Daily usekWh/monthPer dayPer monthPer year
1 hour/day 106.5 $0.85 $25.72 $309
2 hours/day 212.9 $1.69 $51.45 $617
4 hours/day 425.9 $3.38 $103 $1,235
8 hours/day 851.8 $6.76 $206 $2,469
12 hours/day 1,277.6 $10.15 $309 $3,704
24 hours/day 2,555.3 $20.29 $617 $7,407

Connecticut vs other states

At typical use, a central air conditioner costs $2,469 a year in Connecticut — $2,436 less than in Hawaii and $1,169 more than in Louisiana.

Connecticut has the 11th-most-expensive residential electricity of the 50 states and DC. Connecticut price per kWh · all states ranked

Electricity price trend in Connecticut

24.2¢/kWh in July 2026 — ▼ −12.5% from a year earlier.

How to lower the cost of running a central air conditioner

Central AC is usually the single largest electricity user in a home during summer. Power draw depends on capacity (tons) and efficiency (SEER2 rating): a 3-ton system typically draws 3–4 kW while running. The compressor cycles on and off to hold your thermostat setting, so enter the hours per day it actually runs — on a hot afternoon that can be most of the day, while on a mild day it may be only a few hours.

  • Each degree you raise the thermostat in summer saves roughly 3% on cooling.
  • Replace the air filter every 1–3 months and keep the outdoor condenser clear of debris.
  • Use ceiling fans so you can set the thermostat 3–4°F higher with the same comfort.
  • Summers in Connecticut are relatively mild, so cooling costs are concentrated in a few hot weeks each year.

Questions

Frequently asked questions

How much does it cost to run a central air conditioner for 24 hours in Connecticut?

Running a 3,500W central air conditioner for 24 hours uses about 84.0 kWh, which costs about $20.29 at Connecticut’s average rate of 24.2¢/kWh.

How many kWh does a central air conditioner use per month?

At 8 hours a day, a typical central air conditioner uses about 852 kWh a month. In Connecticut that costs $206.

Is it expensive to run a central air conditioner in Connecticut?

Connecticut has the 11th-most-expensive residential electricity of the 50 states and DC at 24.2¢/kWh — pricier than most. Running a central air conditioner here costs about $2,469 a year at typical use, compared with $1,871 at the national average rate.

What is the electricity rate in Connecticut right now?

The average residential electricity rate in Connecticut was 24.2¢ per kWh in July 2026, according to the latest EIA data — down 12.5% from a year earlier.

How many watts does a central air conditioner use?

Most residential central AC systems draw 2,000–5,000W while running; a typical 3-ton system uses about 3,500W.

Central Air Conditioner costs in nearby states

Cheapest and priciest states

Comparisons

Sources & method