There’s an eternal question asked in homes everywhere during the winter: Should you turn up the thermostat for the entire house or just use a portable heater for one cold room?
The bottom line is that it’s not a simple question to answer, because a space heater can be cheaper when you need to warm one room briefly, but central heat is generally cheaper when several rooms or the entire home need warmth.
So the answer to “Which is cheaper to run: Space Heaters or Central Heat?” depends entirely on energy rates, climate, insulation, equipment efficiency, runtime, and the area being heated.
In this guide, we’ll compare operating costs and other variables so you can decide whether central heat or one of Sylvane's space heaters makes sense to use.
Is a Space Heater Cheaper Than Central Heat? The Quick Answer
The space heater vs central heat cost comparison comes down to the area being heated and the type of central system being used. A heat pump usually delivers warmth at a lower operating cost than electric resistance heat. However, a small space heater, which also typically uses electric resistance heat, may use less energy overall if it’s used correctly.
How Much Does It Cost to Run a Space Heater?
You can estimate space heater electricity cost with this formula:
Cost = (watts ÷ 1,000) x hours used x electricity price per kWh
Many full-size heaters draw up to 1,500 watts on high. In June 2026, the U.S. residential average was 18.34 cents per kilowatt-hour, according to the U.S. Energy Information Administration.
At that rate, running a heater continuously on full power would cost:
- One hour: 1.5 kW x $0.1834 = $0.28
- Eight hours: $2.20
- Eight hours daily for 30 days: $66.02
These costs are just an example and may be higher or lower. A thermostat may cycle the heater off after the room reaches the set temperature, while a cold, drafty room or undersized heater may require longer operation.
To get a better estimate of what it will cost, use the marginal electricity rate from your utility bill, including the supply and delivery charges. Exclude fixed monthly fees that do not change with consumption.
Heater style won’t override wattage. Two resistance heaters drawing the same wattage for the same time will typically use the same amount of electricity. Ceramic, infrared, oil-filled, and micathermic designs differ in heat distribution, comfort, noise, and cycling, but none of them are automatically cheaper.
Learn more about electric heater types, efficiency, and cost, or use the space heater buying guide to compare wattage and coverage.
Space Heater or Furnace: Which Is Cheaper?
A furnace's annual fuel utilization efficiency, or AFUE, indicates how much fuel becomes usable heat. A 90 percent AFUE furnace delivers about 90 percent of its fuel's energy as heat.
Natural gas may cost less per unit of delivered heat than electric resistance heating, but a furnace typically heats a much larger area. A space heater may reduce total spending when it warms one room and lets you lower the central thermostat enough to offset its electricity use.
High electricity prices, inexpensive natural gas, poor insulation, long runtime, or multiple portable heaters can reverse the result. A high-AFUE furnace in a well-sealed home may be more economical. The Department of Energy recommends considering energy price, efficiency, installation, maintenance, and lifecycle cost when evaluating a residential furnace.
Space Heater vs. Electric Furnace or Baseboard Heat
Portable heaters, electric furnaces, and electric baseboards primarily rely on electric resistance. A portable heater does not create inherently cheaper heat; its savings opportunity comes from heating less space. It also delivers heat directly to the room, while a ducted furnace uses blower energy and may lose heat through ducts outside conditioned areas.
Space Heater vs. Central Heat Pump
The cost of a space heater vs. a heat pump differs because a resistance heater converts electricity into heat, while a heat pump transfers heat indoors from the air outside (even when it’s cold outside). This allows a heat pump to deliver substantially more heat per kilowatt-hour under suitable conditions. For the same output, it will generally cost less to run.
A portable heater may still use less total energy if it warms one small room while the rest of the home stays cooler. Heat-pump costs also depend on outdoor temperature, sizing, maintenance, thermostat use, and resistance backup heat. See the Department of Energy's overview of heat pump systems.
When a Space Heater Can Save You Money
A space heater is most likely to save money when:
- You spend much of the day in one enclosed room.
- You can lower the central thermostat without making other occupants uncomfortable or allowing plumbing to freeze.
- A guest room or workshop only needs heat occasionally.
- You need a portable, low-upfront-cost solution.
- You use a correctly sized heater with a thermostat, timer, or eco features.
Keep in mind that this is zone heating: Warming the occupied area while keeping unused areas cooler. It works best for one person, one room, and a few hours. Review these heater buying tips for more information.
When Central Heat Is the Cheaper Choice
Central heat is usually the better value when several rooms or people need warmth. It also becomes more economical when a portable heater would run most of the day, multiple heaters are needed, or when the home already has an efficient heat pump/high-AFUE furnace.
Whole-home heating is particularly important in very cold weather, when plumbing and distant rooms must remain at safe temperatures: proper sizing, maintenance, and a programmable or smart thermostat support efficient operation.
Don’t close your home’s supply registers to create makeshift zones unless the manufacturer or an HVAC professional confirms the system supports it. This can restrict airflow and reduce performance if done incorrectly.
Alternatives for Efficient Room-by-Room Heating
Mini-Split Heat Pumps
A mini-split works exceptionally well for a room or zone needing daily heating and cooling. Installation adds some cost compared to space heaters, but operation typically costs less than electric resistance-based heaters. Compare Mini-Split AC and Heat Pump Systems for more details.
Window and Through-the-Wall Units With Heat
A room air conditioner, like a Window or Through-the-Wall AC with heat, can cool and provide supplemental warmth in a bedroom, apartment, or addition. Models may use resistance heat or heat-pump technology. Check heating capacity and operating-temperature limits before browsing window air conditioners with heat or through-the-wall air conditioners with heat.
Portable Air Conditioners With Heat
Portable air conditioners with heat are for people who need mobility and year-round climate control. However, efficiency, capacity, and performance vary by device, so check model specifications.
How to Choose a Cost-Effective Space Heater
Match the BTU output/wattage and manufacturer-recommended coverage to the room you need to heat. Beyond that, we recommend looking for features like an adjustable thermostat, multiple fan speeds/heat settings, a timer or eco mode, tip-over shutoff, and overheat protection.
Choose radiant heat for focused warmth or convection or fan-forced heat for more even room heating. Neither is inherently cheaper at the same wattage and runtime. For bathrooms, use only GFCI models listed for that environment; see how to select a bathroom heater. You can also compare the best space heaters or explore more space heater advice for more recommendations and expert advice.
Space Heater vs. Central Heat FAQs
Does a 1,500-watt space heater use a lot of electricity?
Yes. Compared to many other household devices, a 1,500-watt heater uses quite a bit of electricity, up to 1.5 kWh per hour at full power. But to find out how much that will cost you, multiply 1.5 by your electricity price per kWh for the hourly cost.
Does turning down the thermostat and using a space heater save money?
It can when one small area is occupied, and the central thermostat is lowered enough to offset the heater. It definitely won’t if your central heat stays on at the same time.
Is it cheaper to run two space heaters or central heat?
Central heat often outperforms space heaters as the number of heated rooms and operating hours increase, especially compared to an efficient heat pump or gas furnace. Compare both using local rates and expected runtime before shelling out for either one.
Space Heater vs Central Heat: Which is right for my home?
It might seem like a good idea to grab a space heater whenever your space feels cold, but depending on your home and needs, it might be more efficient to run your furnace.
The rule of thumb is to choose a space heater for short-term warmth in one room, and opt for central heating when you need to cover several rooms for extended periods. But we at Sylvane recommend doing the math for yourself with heater energy usage rates (published by the manufacturer) and your local energy costs before making a decision.
Still need help deciding between space heaters and central heat, or picking out a great space heater? Reach out to Sylvane’s heating experts for personalized recommendations and guidance by calling 1-800-934-9194 or by emailing experts@sylvane.com.
