AC running cost in Connecticut
A typical 2,000 sq ft Connecticut home with average insulation and a 14 SEER2 central AC uses about 686 kWh a year for cooling: roughly $192, peaking in Jul at about $78.
At a glance
Connecticut ranks 24th of 48 contiguous states for estimated yearly AC running cost. Its residential electricity price (27.97¢/kWh) is 54% higher than the U.S. average (18.19¢, EIA) and ranks 6th highest. Its climate brings 607 cooling degree days a year (32nd most), so cooling demand is 45% lower than the 48-state average. Jul is the peak month, carrying about 41% of the year's AC cost; the meaningful cooling season runs Jun–Sep.
| Estimated yearly AC cost (2,000 sq ft, 14 SEER2) | $192 |
| Average across 48 contiguous states (unweighted) | $207 |
| Average residential price, July 2026 YTD | 27.97¢/kWh (U.S.: 18.19¢) |
| Single month, July 2026 | 24.16¢/kWh |
| Annual cooling degree days (NOAA, 1991–2020, base 65°F) | 607 (48-state avg 1,099) |
| Yearly savings, 18 vs 14 SEER2 | $43 |
We haven't verified utility-specific tariffs for Connecticut yet, so this page uses the EIA statewide average. Your utility's rate may differ, so enter it in the calculator below.
Sources: EIA Electric Power Monthly, Table 5.6.B and Table 5.6.A; NOAA NCEI nClimDiv. Statewide averages hide large local differences.
Compared with neighboring states
| State | Price | CDD/yr | Yearly AC cost |
|---|---|---|---|
| New York | 29.38¢ | 618 | $206 |
| Connecticut | 27.97¢ | 607 | $192 |
| Rhode Island | 29.22¢ | 563 | $186 |
| Massachusetts | 30.14¢ | 516 | $176 |
Same home (2,000 sq ft, average insulation, 14 SEER2) in each state.
Month by month
| Month | CDD | kWh | Cost |
|---|---|---|---|
| Jan | 0 | 0 | $0 |
| Feb | 0 | 0 | $0 |
| Mar | 0 | 0 | $0 |
| Apr | 0 | 0 | $0 |
| May | 14 | 16 | $4 |
| Jun | 95 | 108 | $30 |
| Jul ★ | 247 | 279 | $78 |
| Aug | 199 | 225 | $63 |
| Sep | 50 | 57 | $16 |
| Oct | 1 | 1 | $0 |
| Nov | 0 | 0 | $0 |
| Dec | 0 | 0 | $0 |
★ peak month.
Yearly cooling cost by home size and SEER2
| Home | 13 SEER2 | 14 SEER2 | 16 SEER2 | 18 SEER2 |
|---|---|---|---|---|
| 1,200 sq ft | $124 | $115 | $101 | $90 |
| 1,600 sq ft | $165 | $154 | $134 | $119 |
| 2,000 sq ft | $207 | $192 | $168 | $149 |
| 2,500 sq ft | $258 | $240 | $210 | $187 |
| 3,000 sq ft | $310 | $288 | $252 | $224 |
Average insulation; 27.97¢/kWh.
AC monthly running cost calculator
| Month | Cooling degree days | kWh | Cost |
|---|
Price defaults to the state's EIA average residential price (July 2026 YTD); edit it to match your bill. Climate: NOAA state cooling degree days, 1991–2020 average. How this works.