Heating & Cooling · Northeast
Cost to run a electric furnace in New Hampshire
At New Hampshire’s average residential rate of 27.64¢ per kWh, a electric furnace drawing 15000W for 6 hours a day, at a 45% duty cycle, costs about $341 per 30.44 use days. Change the numbers below to match how you actually use yours.
For seasonal use in New Hampshire, enter the days you actually run this electric furnace in the calculator. The reference tables assume 365 use days; they are not a forecast of local weather, your thermostat settings or your annual bill.
Electric Furnace electricity cost calculator
Use watts and running time, or enter energy from a label, meter or completed load. Your inputs stay on this device.
Enter a number within each field’s limits to calculate your cost.
Your estimated energy cost
14,783 kWh across 365 use days per year
Power mode includes your selected duty cycle. The monthly figure assumes 30.44 use days; the annual total uses your selected use days. These are estimates at the entered rate.
Energy charges only. Fixed utility fees, purchase, installation and maintenance are excluded. See the calculation method and sources.
Why the cost differs in New Hampshire
New Hampshire has the 44th cheapest residential electricity of the 50 US states and Washington, DC we track, at 27.64¢ per kWh against a national average of 18.16¢. That is +52.2% compared with the national figure. New Hampshire shares New England's pricing dynamics: winter natural gas pipeline constraints raise generation costs precisely when heating demand peaks. Retail supplier choice is available. Heating dominates annual consumption, and the state's older housing stock means envelope efficiency varies widely, so identical appliances can produce very different bills between neighbouring homes.
For this appliance specifically, the difference works out to an extra $1,401 a year over what the same electric furnace would cost at the national average rate. Run the identical appliance in Hawaii and it would cost $6,974 a year; in Nevada it would cost $1,880. That spread of $5,094 is entirely down to location.
Reducing use by 100 kWh would save $27.64 in energy charges at New Hampshire's average rate, compared with $18.16 at the US average. Whether a replacement appliance pays for itself also depends on its purchase price and the energy it actually saves.
Use the energy and delivery price that applies to your own utility plan in New Hampshire. If your plan has time-of-use prices, calculate each period separately or use a rate weighted by the electricity used in each period. Fixed monthly fees are outside this appliance energy-cost estimate.
| Location | Rate | Per month | Per year |
|---|---|---|---|
| New Hampshire this page | 27.64¢ | $341 | $4,086 |
| US average | 18.16¢ | $224 | $2,685 |
| Nevada cheapest state | 12.72¢ | $157 | $1,880 |
| Hawaii most expensive | 47.18¢ | $582 | $6,974 |
New Hampshire electricity rate trend
Rates in New Hampshire have moved from 27.74¢ to 27.64¢ per kWh between September 2025 and August 2026. The national residential average changed +3.4% from the same month a year earlier.
2025-09 to 2026-08 · cents per kWh
About running a electric furnace
Electric resistance furnaces are the most expensive common way to heat a home. At 10 to 20 kilowatts they dwarf every other load in the house, and in high-rate states the winter cost can exceed the rest of the bill combined.
How we worked this out
The arithmetic is simple and we would rather show it than hide it. Divide watts by 1,000 to get kilowatts, multiply by hours of use and by the duty cycle to get kilowatt-hours, then multiply by your rate:
15000W ÷ 1000 × 6h × 45% = 40.500 kWh/day × 27.64¢ = $11.194 per day
One honest caveat: New Hampshire’s figure is a state average published by the EIA. Your own utility’s tariff, any time-of-use pricing, fixed monthly service charges and local taxes all shift the real number. Put your actual per-kWh rate into the calculator above for a figure that reflects your bill.
How to estimate your electric furnace electricity use
An electric resistance furnace can have several heating stages plus a blower. Its installed heating capacity is a maximum; daily electricity use depends on which stages operate and for how long.
This covers an electric resistance furnace. Gas or oil furnace fuel cost is separate from the electricity used by controls and a blower.
- Use electrical input for the stages actually running. Include blower consumption if your input or measurement does not already include it.
- Calculate mild and cold days separately if staging or runtime differs substantially. One fixed duty cycle cannot reproduce a full heating season.
- A heat pump with auxiliary resistance heat needs separate estimates for compressor and auxiliary use; the resistance-furnace preset is not a heat-pump efficiency model.
- Use seasonal days for annual cost. A month at winter settings is not representative of summer electricity use.
Calculation and data sources
Daily kWh = watts ÷ 1,000 × hours × duty cycle ÷ 100. Multiply kWh by your rate in dollars per kWh to get cost. The wattage, hours and duty cycle above are editable example assumptions, not EIA measurements of this appliance.
The US and state average prices come from the EIA for August 2026. A state average is a starting point; your bill is the better source for your tariff.
Questions about electric furnace running costs
How much electricity does a electric furnace use?
In this example, 15000 watts at a 45% duty cycle uses 6.750 kWh per scheduled hour. At 6.00 hours per day, that is 40.500 kWh per use day. Your model and operating conditions can differ.
How much does it cost to run a electric furnace for an hour?
The default example costs $1.866 per scheduled hour at the New Hampshire average of 27.64¢/kWh for August 2026. This includes the selected duty cycle. Enter your watts, duty cycle and electricity price for your own estimate.
Does the annual cost assume I use it every day?
The reference tables use 365 days at the stated daily hours; monthly figures use 30.44 days. These are comparison scenarios, not forecasts. For a heater used on 90 days, enter 90 use days per year in the calculator.
Why does electricity running cost vary by state?
For August 2026, the EIA state averages range from 12.72¢/kWh in Nevada to 47.18¢/kWh in Hawaii. Equal electricity use costs more at a higher rate. Your utility tariff can differ from the state average.
Should I enter rated watts or average watts?
Use the input that matches your measurement. Rated watts can represent maximum draw. If you know the average watts over the selected hours, enter that average and set duty cycle to 100%; do not reduce it again for cycling.
Does this include the purchase price?
No. This calculator estimates electricity at the entered usage-based rate. Purchase, installation, maintenance and fixed monthly utility charges are separate.
How do I estimate occasional use?
In watts-and-hours mode, enter the hours used on an active day, then select the number of use-days per year. The monthly figure remains a 30.44-day equivalent at that daily use; the annual figure uses your selected days.