How much does it cost to run an air conditioner in New Mexico?

Short answer

A 3-ton central air conditioner in New Mexico costs about $69.07 in July and $213 a year at 15.34¢/kWh; an 8,000 BTU window unit about $14.41 in July.

• New Mexico pays 15.34¢/kWh on average for Jan–Aug 2026 — 16% below the U.S. average of 18.19¢, the 31st most expensive of the 50 states and DC.
• New Mexico averages 893 cooling degree days a year against 1,216 nationally (NOAA), so we estimate 551 full-load cooling hours — 5.8 a day in July.
• A new 3-ton split system sold for New Mexico must reach at least SEER2 14.3 (DOE southwest region); it draws about 2.52 kW on average and $0.39 an hour.
• Moving up to the ENERGY STAR average of about SEER2 17 would cut the yearly bill to $179 — $33.78 a year less.
• The average New Mexico home used 654 kWh a month in 2025; this system adds 450 kWh in July.