Which Appliances Cost the Most to Run

Electric heating, air conditioning, and electric water heating are the first loads to investigate when looking for the appliances that cost the most to run, especially when they operate for long periods. Heating and cooling demand varies substantially with climate, home size, and equipment, so there is no single ranking that fits every household. The useful comparison is electricity consumed over the same period—not simply which appliance has the highest wattage.

Appliance Running Costs: Illustrative Monthly Comparison

Every input in this table is a hypothetical teaching assumption, not a measured product specification, national appliance average, or guaranteed consumption figure. The USD 0.20/kWh rate is an illustrative U.S. residential rate, not an actual tariff for a particular state or utility. Costs include only electricity charged at that assumed rate; the dishwasher example excludes separately supplied hot-water energy.

“Equivalent full-power hours” means the time that would produce the same energy consumption if the equipment operated continuously at the stated input. It does not mean thermostat-enabled hours, time plugged in, or necessarily the actual runtime of variable-speed equipment.

The table shows why runtime matters. Under these assumptions, a single space heater costs more per month than the dryer, refrigerator, oven, dishwasher, and television combined. Different usage patterns can change that order completely.

Why Heating, Cooling, and Hot Water Often Lead the List

Electric space heating and air conditioning

Heating and cooling serve an entire space rather than a single short task. Their energy consumption responds to weather, insulation, air leakage, thermostat settings, and the equipment serving the building. EIA identifies space heating and air conditioning as major household energy uses and emphasizes their geographic and seasonal variation.

That finding needs a careful distinction: EIA’s household energy totals include fuels such as natural gas, not just electricity. A home with a gas furnace may use relatively little electricity for heating compared with an otherwise similar home using electric resistance heat. Do not turn an all-fuel household energy statistic into an appliance electricity ranking.

For air conditioners, use electrical input in watts or kilowatts—not cooling capacity in Btu/h or tons. Cooling output and electrical consumption are different quantities. For a cycling or variable-speed system, measured kWh over a representative period gives a better cost basis than assuming maximum input for every hour the thermostat is on.

Seasonal costs also need seasonal comparisons. The table’s air-conditioning example represents one assumed cooling month; multiplying it by 12 would incorrectly assume identical operation throughout the year.

Electric resistance water heaters

An electric resistance water heater can accumulate substantial consumption because it heats water repeatedly throughout the day. Its running cost depends on hot-water demand, incoming water conditions, standby losses, and operating settings. The element’s rated power alone does not tell you monthly consumption.

Equipment type matters. Heat pump water heaters move heat into the water rather than relying entirely on resistance elements. Their auxiliary resistance elements can increase energy use when operating conditions or hot-water demand require them, so operating mode matters when comparing two electric water heaters.

For a tank with multiple elements, do not automatically add all element ratings. Use the manufacturer’s operating information to establish which elements can run simultaneously, or use measured energy consumption.

Portable heaters and long-running moisture-control equipment

Portable heaters are easy to overlook because they are small, but the example shows how a modest load operated for many hours can become a major monthly expense.

Dehumidifiers deserve the same runtime check. A unit that operates briefly is a different cost proposition from one that runs much of the day. Confirm actual operating time or measured kWh rather than assuming that every hour plugged in is an hour at full input. DOE likewise cautions that sample appliance wattages are only examples; actual consumption varies with the product and its features.

Clothes Dryers, Refrigerators, and Kitchen Appliances

Clothes dryers: compare complete cycles

For a dryer, energy per complete load is more useful than heater wattage alone. A cycle includes changing operating conditions, and the number of loads determines the monthly total.

In the table’s hypothetical example:

[
20\text{ cycles/month}\times3\text{ kWh/cycle}
=60\text{ kWh/month}
]

[
60\text{ kWh/month}\times\text{USD }0.20/\text{kWh}
=\text{USD }12.00/\text{month}
]

Dryer technology can change the result. Heat pump dryers reuse heat in a closed-loop process rather than exhausting heated air in the same way as a conventional vented dryer. ENERGY STAR provides model comparisons and efficiency information, including Combined Energy Factor; higher CEF indicates greater efficiency. Use model-specific data rather than applying a generic dryer estimate to every technology.

For a gas dryer, electricity is only part of the running cost. A fair comparison must also include the gas consumed and its applicable price.

Refrigerators and freezers: continuous availability is not continuous full-power operation

A refrigerator remains available around the clock, but that does not justify multiplying maximum wattage by 24 hours every day. Its consumption changes as cooling and other operating functions cycle.

For an initial estimate, use the model’s annual kWh figure where available. The FTC explains that EnergyGuide labels help compare appliance energy use, while the printed operating cost reflects assumed usage and a national average energy price—not necessarily what you will pay locally.

For the table’s hypothetical refrigerator:

[
600\text{ kWh/year}\div12
=50\text{ kWh/month}
]

[
50\text{ kWh/month}\times\text{USD }0.20/\text{kWh}
=\text{USD }10.00/\text{month}
]

This is an annualized monthly estimate, not a prediction that every month will consume exactly 50 kWh. Check additional refrigerators and freezers separately; each contributes its own consumption.

Ovens, dishwashers, and small appliances: wattage can overstate their importance

An oven or kettle can draw substantial power while operating, yet contribute less monthly energy than a lower-power appliance used for many hours. DOE’s appliance-cost method combines wattage with usage time precisely because neither input is sufficient on its own.

For example, an assumed 1,500 W kettle used for six minutes per day consumes:

[
6\text{ minutes}\div60=0.1\text{ hour}
]

[
1.5\text{ kW}\times0.1\text{ hour/day}\times30\text{ days}
=4.5\text{ kWh}
]

At the illustrative rate, its monthly electricity cost is USD 0.90. That is much less than the table’s 100 W television used for four hours daily, despite the kettle’s higher instantaneous power.

Dishwashers and clothes washers also require a clear cost boundary. If a measurement covers only electricity entering the appliance, separately supplied hot-water energy is outside that measurement. If the calculation already includes that water-heating energy, do not add it again.

Calculate Which Appliances Cost the Most in Your Home

Use energy consumption, not power alone

The basic relationships are:

[
\text{Energy (kWh)}
=\frac{\text{Power (W)}}{1{,}000}\times\text{Operating time (hours)}
]

[
\text{Electricity cost (USD)}
=\text{Energy (kWh)}\times\text{Applicable price (USD/kWh)}
]

DOE uses this wattage-and-time approach for appliance energy estimates. For equipment that changes power during operation, use measured kWh, complete-cycle consumption, or an appropriate annual consumption estimate instead of treating nameplate wattage as a constant draw.

Here, kWh is energy consumed over time. kW is power at a particular moment. Your running-cost ranking should normally compare kWh over the same period, adjusted for the price applicable when each appliance operates.

Build a household-specific ranking

1. Identify likely large loads. Start with electric heating, cooling, water heating, and long-running equipment, then check dryers and additional refrigerators or freezers.
2. Find an appropriate consumption input. Use model-specific annual kWh, complete-cycle energy, or measured consumption. Treat generic wattage examples as starting assumptions only.
3. Match usage to the billing period. Record actual days, cycles, or operating hours. Do not compare a winter heating month with annualized refrigerator consumption without explaining the difference.
4. Apply your applicable electricity price. Use the charges that change with consumption under your utility tariff, not an assumed national price.
5. Calculate and sort monthly costs. Keep measured figures separate from label-based estimates and hypothetical assumptions.
6. Reconcile the estimates with the bill. Check total household kWh before comparing dollar totals, and allow for loads not yet included.

For compatible plug-in equipment, use an energy monitor only within its stated voltage, current, and connection ratings. Do not adapt an ordinary plug-in monitor for a hardwired or incompatible appliance; use existing monitoring data or have a qualified electrician arrange suitable measurement.

Worked example: a cycling space heater

Assume a hypothetical U.S. household uses a 1,500 W heater during a five-hour evening period for 30 days. Monitoring indicates that its heating element is energized for 60% of that period. Assume USD 0.20/kWh and ignore any separate control or fan consumption.

First, calculate equivalent full-power time:

[
5\text{ hours/day}\times0.60=3\text{ hours/day}
]

Then calculate monthly energy:

[
\frac{1{,}500}{1{,}000}\times3\times30
=135\text{ kWh/month}
]

Finally, calculate cost:

[
135\times\text{USD }0.20
=\text{USD }27.00/\text{month}
]

Assuming full power for all five hours would instead give 225 kWh and USD 45.00. The difference comes from the runtime assumption—not a change in the heater’s rating. The 60% fraction is specific to this example and should not be reused as a standard duty cycle.

Choose the Right Electricity Price

As of October 12, 2026, the latest available EIA Electric Power Monthly release covered July 2026 and was published September 24, 2026. EIA reported a U.S. residential average price of 18.31 cents/kWh, equivalent to USD 0.1831/kWh, for that month. This is a national residential starting reference, not a full-year 2026 average or a local utility tariff.

EIA calculates this price from retail revenues and electricity sales; it does not directly collect each household’s tariff. That distinction matters when estimating how much switching off an appliance would save.

Use your utility’s current tariff and bill to distinguish:

• Consumption-based charges: the applicable energy charge and other charges that increase with kWh.
• Fixed charges: charges that remain even when appliance consumption falls.
• Time-dependent prices: different prices for electricity used in different periods.
• Demand charges, where applicable: charges requiring a separate calculation under the tariff’s demand-measurement rules.

Dividing the entire bill by total kWh gives a blended bill average, but it can allocate fixed charges to appliances and overstate avoidable savings. For an appliance running across different price periods, calculate each period separately:

[
\text{Cost}
=\sum_i\left(\text{kWh in period }i\times\text{Price in period }i\right)
]

A high-wattage appliance is not automatically the most expensive appliance to run. Compare consumption over the same period, use actual operating conditions, and separate energy-dependent savings from charges that remain on the bill.

Focus Savings on the Largest Verified Costs

Prioritize the appliances with the largest calculated or measured costs—not simply the largest nameplate ratings. In the opening example, reducing resistance-heater operation by one full-power hour each day saves:

[
1.5\text{ kW}\times1\text{ hour/day}\times30\text{ days}
=45\text{ kWh/month}
]

[
45\times\text{USD }0.20
=\text{USD }9.00/\text{month}
]

Those savings depend on genuinely reducing consumption. If another heating system replaces the same heat, include its additional electricity or fuel cost before claiming a net saving.

For replacements, compare model-specific energy use under consistent assumptions. EnergyGuide estimates support comparisons, but the FTC explicitly warns that actual operating costs depend on usage and local energy prices. A lower running cost alone does not establish whether replacing a functioning appliance is financially worthwhile.

Appliance Cost Self-Check

• Every appliance is compared over the same billing period.
• Input power is electrical consumption, not heating or cooling output.
• Cycling equipment is not assumed to draw full power whenever plugged in.
• Cycle-based calculations use complete-cycle energy and the correct number of loads.
• Annual label consumption is identified as an estimate, not a measured monthly total.
• The electricity price matches the location, customer class, and applicable tariff.
• Fixed charges are excluded from claims about avoidable energy costs.
• Gas consumption and separately supplied hot-water energy are included where relevant, without double counting.
• Hypothetical assumptions remain clearly separated from measured data and manufacturer specifications.

The most useful result is a household-specific cost ranking with traceable inputs. It shows which loads deserve closer measurement, which usage changes can materially affect the bill, and where generic appliance rankings would lead you in the wrong direction.