How Much to Run a Space Heater in Connecticut? $582/Winter
Running space heater in Connecticut costs about $0.42 an hour and roughly $582 for the winter — 1,500 W for 7.5 hours a day at 28.26¢/kWh.
· Source: EIA Electric Power Monthly Table 5.6.A (July 2026 data) · next EIA update ~Oct 23
On this page: CalculatorTableHow we calculatedSources
Jump to calculator ↓Slider nudges the Connecticut rate; the URL keeps it.
- Per hour
- $0.42 at 28.26¢/kWh
- Per winter
- $582 (182 days)
- Hours per day
- 7.5 (NOAA state heating degree-days-scaled)
- Degree-days used
- 5,282 (NOAA CPC state, population-weighted)
- Wattage
- 1,500 W (typical 750–1,500)
- Connecticut rate
- 28.26¢ (October 2025–March 2026 average)
- Rank of 20 cold states
- 6 (6th most expensive)
Why this number
Connecticut runs space heater longer than the national baseline in October–March — 7.5 hours a day on the NOAA state degree-day scaling used here, against 5.0 nationally — and pays 28.26¢/kWh for it. Those two numbers, times 1,500 W, are the whole $582.
Space heater cost in Connecticut by hours per day — per day / per winter
| Hours per day | Connecticut avg 28.26¢ | Connecticut Light & Po 25.3¢ | United Illuminating Co 31.1¢ | Constellation NewEnerg 12.7¢ |
|---|---|---|---|---|
| 1 h | $0.42 / $77 | $0.38 / $69 | $0.47 / $85 | $0.19 / $35 |
| 2 h | $0.85 / $154 | $0.76 / $138 | $0.93 / $170 | $0.38 / $69 |
| 4 h | $1.70 / $309 | $1.52 / $276 | $1.87 / $340 | $0.76 / $139 |
| 6 h | $2.54 / $463 | $2.28 / $414 | $2.80 / $509 | $1.14 / $208 |
| 8 h | $3.39 / $617 | $3.04 / $553 | $3.73 / $679 | $1.52 / $277 |
| 12 h | $5.09 / $926 | $4.55 / $829 | $5.60 / $1,019 | $2.29 / $416 |
What Connecticut’s utilities charge for it
| Utility | Residential customers | ¢/kWh (EIA-861 2024) | Per hour | Per winter at 7.5 h/day |
|---|---|---|---|---|
| Connecticut Light & Power Co | 1,174,420 | 25.3¢ | $0.38 | $521 |
| United Illuminating Co | 312,291 | 31.1¢ | $0.47 | $641 |
| Constellation NewEnergy, Inc | 125,376 | 12.7¢ | $0.19 | $262 |
What the numbers say about space heater in Connecticut
Connecticut logged 5,282 population-weighted heating degree-days over October–March (NOAA CPC state series), 151% of the CONUS figure of 3,500, which is why this page runs space heater 7.5 hours a day against the national 5.0 — 2.5 hours more. At Connecticut’s October 2025–March 2026 average rate of 28.26¢/kWh that makes it the 6th most expensive of the 20 cold states for space heater: $582 for the 182-day winter, against Nebraska’s $220 and Maine’s $752. Connecticut Light & Power Co, Connecticut’s largest utility with 1,174,420 residential customers, averages 25.3¢ — $521 for the same hours — while Constellation NewEnergy, Inc at 12.7¢ comes to $262, a $260 spread on identical use. Per million Btu delivered, resistance heat at 28.26¢ costs $82.82 against $17.68 for natural gas at Connecticut’s winter average of $1.68/therm, so a 1,500 W heater is a room-by-room supplement in Connecticut, not a whole-house plan. Connecticut’s winter-average rate (28.26¢) sits 4.10¢ above its July 2026 reading of 24.16¢; the season figure uses the winter average because that is when space heater runs.
Frequently asked questions
How much does it cost to run space heater per hour in Connecticut?
$0.42 an hour for a 1,500 W unit at Connecticut’s October 2025–March 2026 average average of 28.26¢/kWh (1,500 ÷ 1,000 × 0.2826); at Connecticut Light & Power Co’s 25.3¢ it is $0.38.
How much does space heater cost for the whole winter in Connecticut?
About $582: 1,500 W × 7.5 hours a day × 182 days (October–March) × 28.26¢. The hours are the national 5.0 h/day scaled by NOAA CPC state population-weighted HDD, October 2025–March 2026 (5,282 against the CONUS 3,500); enter your own hours above for your own figure.
Is space heater expensive to run in Connecticut compared with other cold states?
Connecticut is the 6th most expensive of the 20 cold states on this site at $582 a winter; the range runs from Nebraska ($220) to Maine ($752), driven almost entirely by the electricity rate.
How we calculated this
Worked for space heater in Connecticut: 1,500 W ÷ 1,000 × 0.2826 $/kWh = $0.42 per hour; hours per day = 5.0 × (5,282 ÷ 3,500) = 7.5; 1,500 ÷ 1,000 × 7.5 × 182 × 0.2826 = $582 for the winter. Rate: EIA Electric Power Monthly 5.6.A (October 2025–March 2026 average); degree-days: NOAA CPC state population-weighted HDD, October 2025–March 2026, against the CONUS total; utility prices: EIA-861 2024.Sources: U.S. Energy Information Administration (EIA) electricity rates · DSIRE incentive records · public IRS/OBBBA guidance. Figures are modeled estimates, not quotes or tax advice. See our methodology.
Where to go next
- Cost to run space heater (national page) — The 1,500 W and 5.0 h/day baseline this page scales for Connecticut, with the sourced benchmark.
- Cost to heat a home in Connecticut — Gas, propane, oil, heat pump and resistance per MMBtu at Connecticut’s own prices — the whole-house picture.
- Find your electricity rate by ZIP — Connecticut averages 28.26¢ but its utilities span the table above — send your own rate into this calculator.
- Solar panel cost in Connecticut — Connecticut’s 24.16¢ July rate, utilities and rate history on the solar side.
- Cost to run heat pump in Connecticut — Same Connecticut rates and degree-days applied to a 3,500 W heat pump.
- Cost to run ductless mini-split in Connecticut — Same Connecticut rates and degree-days applied to a 2,000 W ductless mini-split.
- Cost to run space heater in New York — $592 for the winter at 27.96¢ and 7.8 h/day — the nearest cold-state comparison.
- Cost to run space heater in Vermont — $621 for the winter at 23.81¢ and 9.6 h/day — the nearest cold-state comparison.