Space Heater Cost to Run by State

The formula behind every number on this page

Every space heater's running cost comes down to one calculation: kilowatts x hours used x price per kilowatt-hour. RapidHeat and nearly every compact plug-in ceramic heater on the market draws about 1,500 watts on its high setting, which is 1.5 kW. Multiply 1.5 by the hours you run it, then multiply that by your electric rate in dollars per kWh. That is your cost, full stop — no brand changes this math, because a resistance heating element converts essentially all the electricity it draws into heat.

The US Energy Information Administration (EIA) tracks the average residential electricity price by state every month, and it is worth checking their published data directly since rates shift with fuel costs and seasons. For quick, illustrative math we use 17 cents per kWh, which is close to the recent national average residential rate — but your own state, and even your own utility company within a state, can be meaningfully higher or lower.

Approximate residential rates and the cost to run a 1,500W heater, state by state

The table below uses approximate average residential rates covering more than three dozen states plus the highest- and lowest-rate outliers. Treat these as ballpark figures for comparison, not your exact bill — rates change throughout the year and vary by utility. Always check your own bill for the number that actually applies to you. The "per month" column assumes 8 hours of use a day for 30 days, a reasonable estimate for regular evening and early-morning use in the coldest months.

Cheapest and most expensive states, in general terms

Rates tend to run lowest across parts of the Pacific Northwest, the Mountain West and the South, where a 1,500W heater can cost well under 20 cents an hour. New England states and Hawaii typically post the highest residential rates in the country, sometimes triple the national average, which means the exact same heater running the exact same number of hours costs three times as much there. This is purely a function of the local electricity market — it has nothing to do with the heater itself. For more general running-cost math, see our guide to what a space heater costs to run.

A closer look by region

Pacific Northwest and Mountain West

Washington, Idaho, Utah and Montana benefit from a mix of hydroelectric and lower-cost generation, which keeps rates near or below 15 cents/kWh. A household in this region running RapidHeat for 8 hours a day through a 5-month heating season (roughly 150 days) spends somewhere in the $85-$105 range in total electricity cost for that use pattern — noticeably less than the same routine in the Northeast.

South and South Central

States like Oklahoma, Arkansas, Louisiana and Tennessee post some of the lowest rates in the country, generally 12-14 cents/kWh. Winters here also tend to be shorter and milder, so total seasonal heating hours are often lower too, compounding the savings versus colder, higher-rate regions.

Midwest and Mid-Atlantic

Illinois, Michigan, Pennsylvania and New Jersey sit in a middle band, generally 16-18.5 cents/kWh. Combined with longer, colder winters than the South, households here often log more total heating hours even though the per-hour rate is only moderately higher, which raises the seasonal total more than the rate alone suggests.

New England, New York and Hawaii

Connecticut, Massachusetts, Rhode Island, New Hampshire, Vermont, New York and Hawaii post the highest residential rates in the country, often 21-41 cents/kWh. In these states the same 8-hour daily habit that costs roughly $60/month in a low-rate state can cost $130-$200/month, which is exactly why heating only the occupied room, rather than the whole house, matters most in these regions.

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Seasonal totals: what a full winter actually costs

A single evening's cost looks small, but it is worth totaling across a heating season. Assume 8 hours a day, roughly 150 days (about 5 months, October through February) of regular use — a realistic pattern for someone using a space heater to warm a bedroom or office rather than running a furnace all day.

Even at the high end, a full season of daily space-heater use in a high-rate state is typically far less than the cost of raising the thermostat for an entire home over the same period, especially in a house or apartment with more than one or two occupied rooms.

Finding your exact rate

Skip the estimates and use your own number: pull out your latest electric bill and look for a line item showing cents per kilowatt-hour, sometimes labeled "energy charge" or "supply rate." If your bill only shows a total dollar amount, divide that by the total kWh used that period to back into your effective rate. Many utilities also publish current residential rate schedules on their websites. Once you have your rate, plug it into the energy savings calculator for a number specific to your home and habits.

Why heating one room usually wins regardless of your state's rate

Whatever your state's rate is, the bigger lever is how much space you heat, not the heater's wattage. A central furnace or heat pump conditions your entire home; a space heater like RapidHeat conditions the one room you are sitting in. Even in a higher-rate state, running a 1,500W heater in a bedroom for a few hours in the evening typically costs less than raising the thermostat for the whole house over the same period. See how the two approaches compare directly in space heater vs. central heating.

Choosing the right size heater for your room

Running cost only tells half the story — the other half is whether the heater is sized correctly for the room. An undersized heater running constantly at full power to keep up with a large space actually costs more over time than a correctly sized unit cycling on a thermostat. Check our guide on what size space heater you need before assuming a bigger unit is always better value.

Practical ways to lower the number, wherever you live

Behavior changes that cost nothing

• Use the thermostat instead of running on high constantly.
• Set a timer instead of leaving it on all night or all day.
• Heat only the room you are in, and close the door to hold the heat there.
• Check for drafts around windows and doors, which force any heater to work harder.
• Lower the target temperature by even 1-2 degrees; each degree meaningfully reduces run time.

Setup changes that pay off over a season

• Weatherstrip doors and windows in the room you heat most.
• Use draft stoppers at the base of doors leading to unheated hallways.
• Position the heater where airflow reaches you directly rather than behind furniture that blocks it, so it does not need to run as long to feel warm.
• Compare the 1, 2 and 3-pack bundle pricing if you plan to heat more than one room, since running two correctly sized heaters briefly is often cheaper than one heater working overtime to reach a larger space.

Common questions