A 3-ton central air conditioner in Georgia costs about $103.84 in July and $409 a year at 15.48¢/kWh; an 8,000 BTU window unit about $21.67 in July.
At 15.48¢/kWh — Georgia average, Jan–Aug 2026 (EIA). That is 15% below the U.S. average of 18.19¢.
| Efficiency | Per year | vs yours |
|---|---|---|
| SEER2 13.4 (min · North) | $436 | +$27.46 |
| SEER2 14.3 (min · South) | $409 | — |
| SEER2 15.2 (ENERGY STAR) | $385 | −$24.21 |
| SEER2 17 (ES average) | $344 | −$64.94 |
| Month | Full-load hours | 3-ton central | 8,000 BTU window |
|---|---|---|---|
| January | 6 | $2.40 | $0.50 |
| February | 3 | $1.20 | $0.25 |
| March | 14 | $5.29 | $1.10 |
| April | 23 | $8.89 | $1.86 |
| May | 98 | $38.22 | $7.97 |
| June | 197 | $76.92 | $16.05 |
| July | 266 | $103.84 | $21.67 |
| August | 244 | $95.18 | $19.86 |
| September | 146 | $56.97 | $11.89 |
| October | 40 | $15.62 | $3.26 |
| November | 8 | $3.12 | $0.65 |
| December | 3 | $1.20 | $0.25 |
DOE's room-AC test assumes 750 full-load hours a year for a typical U.S. home. We scale it by Georgia's population-weighted cooling degree days (1,701 ÷ 1,216) and spread it over the months the same way: 1,049 hours a year. Your thermostat setting and insulation move this a lot — switch the calculator to your own hours if you know them.
3 tons = 36,000 BTU/h ÷ SEER2 14.3 = 2,517 W. × 1,049 h = 2,641 kWh × 15.48¢ = $409.
The full method, material data and tips are on the main air conditioner cost calculator page.