What Uses the Most Electricity in a Home?

By Yasir Siraj · Last updated 22 October 2026

Across all US homes, air conditioning, by a clear margin. Then space heating and water heating, tied. Together those three account for about 43% of the electricity US homes use. Look only at the homes that have a given appliance, though, and the order changes — the table further down shows how.

Lighting and refrigerators come next, and after that the numbers get small fast — considerably smaller than most people assume.

The three biggest, by EIA's own figures

After those three come lighting and refrigerators. EIA names them as the next two largest but does not publish a single headline percentage for either, so none is given here.

U.S. Energy Information Administration, 2020 Residential Energy Consumption Survey, shares of residential site electricity consumption (source).

Why most articles quote the wrong number

Search this question and you will repeatedly read that heating and cooling are "about half of your home energy use". That figure is real, and it is the wrong one for an electricity bill.

The distinction matters because it changes what you should do. If you heat with gas, turning the thermostat down barely touches your electricity bill — it shows up on the gas bill instead. If you heat with electricity, it is one of the largest things you control.

So the first question is not "what uses the most electricity" in general. It is what in your house actually runs on electricity.

Air conditioning is first for a reason

Cooling is almost entirely electric almost everywhere, which is why it tops the electricity table while space heating does not. It is also intensely seasonal: 19% is an annual average, so in a hot month it can be a far larger share of that month's bill, and in winter close to none of it.

That seasonality is the single most common reason a summer bill looks alarming when nothing about the household changed. If your bill jumps in July, start by comparing kWh against the same month last year rather than against June.

The thing that trips people up: duty cycle

A refrigerator is rated at perhaps 150 watts, but its compressor only runs a fraction of the time. Averaged over a day its real draw is far lower than the label suggests. The same applies to anything thermostat-controlled — air conditioners, heaters, water heaters.

This is why "watts on the label" is a poor guide to what something costs. A 1,500W space heater running constantly will out-consume a 3,500W air conditioner that cycles on for ten minutes an hour — what a space heater costs to run works that through state by state.

The appliance running cost calculator takes hours-per-day as an input for exactly this reason. Estimate the hours something is genuinely drawing power, not the hours it is switched on.

What each appliance uses in a year

Appliance labels tell you how much power something draws when it is running, not how much electricity it uses over a year. EIA's survey gives us a more useful picture: estimated annual electricity consumption, modeled from household survey responses and utility billing records rather than metered appliance by appliance. That makes it possible to compare appliances without assuming they run at full power all day. The cost column prices that consumption at the US average of 18.04¢ per kWh over the past twelve months.

U.S. Energy Information Administration, 2020 Residential Energy Consumption Survey, tables CE5.3a and CE5.3b: average site electricity per household using each end use (source). Monthly figures are the yearly figure divided by twelve, and the cost column prices them. Space heating includes main and secondary heating, so it mixes whole-house electric heat with occasional plug-in heaters. Every row applies only to homes that have that appliance: a home with no electric vehicle, pool or hot tub uses none of that electricity. Air conditioning includes evaporative coolers but not the furnace fan, which EIA counts separately. TVs include cable boxes, streaming devices and game consoles. The dishwasher and washer figures cover the machine only; heating their water is counted under the water heater.

One thing surprised me when I looked at these figures: on average, an electric water heater uses more electricity in a year than air conditioning does — 2,706 kWh against 2,318, each averaged over the homes that have one. That sounds odd when air conditioning leads the national electricity-use rankings, but the two tables answer different questions. The share figures reflect electricity use across all homes, while this table averages consumption only among households that have each appliance. Nearly nine in ten US homes use air conditioning, but fewer than half heat their water with electricity, so air conditioning adds up to more nationally even though the average electric water heater uses more (EIA, 2020 RECS, tables HC7.1 and HC8.1). Each row describes a different group of households, so adding the figures together would not give you a typical home's total.

Dividing annual consumption by twelve makes the numbers easier to compare, but it smooths out the seasons. An air conditioner can use a lot of electricity during a hot summer, while electric heating peaks in winter. Pool pumps also tend to work harder during swimming season. Their monthly averages are useful for comparison, not a prediction of what any one month will cost.

What is smaller than people think

Lighting still makes EIA's top five, but it has fallen sharply as LEDs replaced incandescent bulbs — an LED drawing 10 watts does the work of a 60-watt bulb. Replacing bulbs is worth doing; it will not rescue a bill driven by an old air conditioner.

Electronics land in about the same place: a TV and everything plugged into it averages 632 kWh a year, close to lighting's 654. Individual devices are small. Using the mid-range figures from our appliance calculator — a laptop around 50 watts, a game console around 150, a modern TV around 90, all illustrative rather than measured for your specific model — running a laptop eight hours a day for a month comes to roughly 12 kWh: $2.16 at the same US average of 18.04¢ per kWh used in the table above.

Standby draw is the exception worth taking seriously. The US Department of Energy is widely quoted putting devices left plugged in but idle at 5–10% of residential energy use.

That is an energy figure, not an electricity one — the same distinction this page has been making throughout. Standby draw is almost entirely electric, so taken literally the figure would make standby an even larger share of an electricity bill — which sits awkwardly with how small electronics turn out to be above. The honest position is that the precise number is not established: I could not find a primary Department of Energy table stating it, only secondary sources quoting the agency. I would rather leave a number out than repeat one I cannot verify against the right measure.

How to find your own biggest user

1. Work out what runs on electricity. Heating and hot water are the ones that vary most between homes. If both are electric, they dominate.
2. Check the seasonal swing. Compare your highest and lowest month's kWh. A big gap points at heating or cooling; a flat line points at something running year-round.
3. Test a suspicion. Put the wattage and realistic hours into the appliance calculator and see whether the numbers could plausibly explain the gap.
4. Check the rate, not just the usage. If your kWh is flat but the bill rose, the cause is price. See what your state's average rate has done.

Where the effort is worth it

Roughly in order of impact for a typical all-electric home:

• Cooling and heating settings. Largest share, and a couple of degrees on the thermostat costs nothing to try.
• Water heating. Joint second. The Department of Energy suggests 120°F for most homes, with a caveat for some households; what an electric water heater costs to run covers the setting and the bigger changes.
• Shifting load to off-peak, if your utility offers a time-of-use rate. Laundry, dishwasher and EV charging move easily.
• Standby draw, for the handful of devices that genuinely sit idle all day.
• Lighting, last. Worth doing, small in effect.

Next steps