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

Cooling · Idaho

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

The short answer

A typical 3,500W central air conditioner costs about $0.48 per hour to run in Idaho, or $117 a month at 8 hours a day.

Idaho’s average residential rate was 13.7¢ per kWh in July 2026 (EIA), 25% below the US average.

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

Central Air Conditioner cost by daily use in Idaho

Cost at 13.7¢/kWh, the Idaho average (EIA, Jul 2026)
Daily usekWh/monthPer dayPer monthPer year
1 hour/day 106.5 $0.48 $14.62 $175
2 hours/day 212.9 $0.96 $29.24 $351
4 hours/day 425.9 $1.92 $58.47 $702
8 hours/day 851.8 $3.84 $117 $1,403
12 hours/day 1,277.6 $5.77 $175 $2,105
24 hours/day 2,555.3 $11.53 $351 $4,210

Idaho vs other states

At typical use, a central air conditioner costs $1,403 a year in Idaho — $3,502 less than in Hawaii and $103 more than in Louisiana.

Idaho has the 6th-cheapest residential electricity of the 50 states and DC. Idaho price per kWh · all states ranked

Electricity price trend in Idaho

13.7¢/kWh in July 2026 — ▲ +11.8% 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 Idaho 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 Idaho?

Running a 3,500W central air conditioner for 24 hours uses about 84.0 kWh, which costs about $11.53 at Idaho’s average rate of 13.7¢/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 Idaho that costs $117.

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

Idaho has the 6th-cheapest residential electricity of the 50 states and DC at 13.7¢/kWh — one of the cheapest. Running a central air conditioner here costs about $1,403 a year at typical use, compared with $1,871 at the national average rate.

What is the electricity rate in Idaho right now?

The average residential electricity rate in Idaho was 13.7¢ per kWh in July 2026, according to the latest EIA data — up 11.8% 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.

Sources & method