How much does it cost to run an air conditioner in North Carolina?

Short answer

A 3-ton central air conditioner in North Carolina costs about $91.86 in July and $322 a year at 14.94¢/kWh; an 8,000 BTU window unit about $19.17 in July.

• North Carolina pays 14.94¢/kWh on average for Jan–Aug 2026 — 18% below the U.S. average of 18.19¢, the 35th most expensive of the 50 states and DC.
• North Carolina averages 1,387 cooling degree days a year against 1,216 nationally (NOAA), so we estimate 855 full-load cooling hours — 7.9 a day in July.
• A new 3-ton split system sold for North Carolina must reach at least SEER2 14.3 (DOE southeast region); it draws about 2.52 kW on average and $0.38 an hour.
• Moving up to the ENERGY STAR average of about SEER2 17 would cut the yearly bill to $271 — $51.10 a year less.
• The average North Carolina home used 1,043 kWh a month in 2025; this system adds 615 kWh in July.