Air conditioning was the biggest single use of electricity in US homes in 2020. It made up 19% of residential site electricity, according to the U.S. Energy Information Administration (EIA), while space heating and water heating each made up 12%. So heating, cooling, and hot water usually top the list, and everyday appliances follow behind.
Quick answer
Heating, cooling, and water heating usually use the most electricity. Which one is number one depends on your climate, home size, and fuel. After those, check dryers, refrigerators, electric showers, and ovens.
- Best for hot climates: check air conditioning first.
- Best for gas-heated homes: check hot water, dryer, and fridge.
- Best for all-electric homes: check heating and hot water first.
- Air conditioning, space heating, and water heating are the three largest categories of US residential electricity use (EIA, 2020).
- UK figures for heating and hot water describe total energy, not electricity alone.
- Cost equals kilowatts times hours times your price per kWh. Power rating, running time, and tariff all matter.
- A plug-in energy monitor or smart meter will show your real biggest loads.
- Standby power is usually small next to heating, cooling, drying, and hot water, but it runs all year.
- What Uses the Most Electricity in a Home?
- What Uses the Most Household Electricity in the UK?
- Which Household Appliances Use the Most Electricity?
- Washing Machine, Dishwasher, or Tumble Dryer: Which Uses More?
- How to Work Out What an Appliance Costs to Run
- Two Homes, Two Different Answers
- How Can I Find What Is Using the Most Electricity in My Home?
- How Much Electricity Do Appliances Use on Standby?
- What Should I Switch Off or Replace First?
- Frequently Asked Questions
What Uses the Most Electricity in a Home?
Heating, cooling, and water heating use the most electricity in most homes. The EIA names air conditioning, space heating, and water heating as the three largest categories of residential electricity use in 2020. You can read the breakdown on the EIA page on electricity use in homes.
The same EIA data puts refrigerators at about 7% of residential electricity use and clothes dryers at about 5%. Microwaves, dishwashers, and cooking each account for smaller shares.
Does heating or air conditioning use more electricity?
It depends on where you live and how you heat. Across the US in 2020, air conditioning (19%) used more electricity than space heating (12%). That is because many homes heat with natural gas, propane, or oil, so that heat never shows up as electricity. A home with electric baseboards or a heat pump in a cold state can flip the result.
Do electric showers and water heaters use a lot of electricity?
Yes, they do. An electric tank water heater is one of the biggest loads in a home. Its heating element is commonly rated around 4,500 watts, and it switches on whenever the tank cools down. UK electric showers are rated around 7,000 to 10,500 watts, which is huge. They only run for the minutes you stand under them, so the habit matters as much as the rating.
What Uses the Most Household Electricity in the UK?
In the UK, most homes heat with gas, so electricity is dominated by appliances, lighting, and electronics. Homes with electric heating, heat pumps, or electric showers are the exceptions. Their biggest loads look more like the US list above.
The wider energy picture is very different. Government statistics in Energy Consumption in the UK (ECUK) 2026 show space heating at 60.8% of total domestic energy use in 2025, with water heating at a further 17.4%. Those figures cover all fuels, not electricity alone. A separate 2023 estimate puts household energy at about 80% heating and hot water, 15% appliances, and 6% lighting and cooking.
Do not read these as electricity shares. If your heating is gas, your electricity bill is mostly the 15% to 20% slice: fridge, laundry, cooking, lighting, and gadgets.
Which Household Appliances Use the Most Electricity?
Heating and cooling equipment, water heaters, and electric showers draw the most power. Dryers, ovens, and fridges follow. The table below uses typical rating-plate ranges and rough annual bands. Your label, your habits, and your climate will change the result.
| Item | Typical power | Likely annual use (rough) | Relative impact | What changes the cost |
|---|---|---|---|---|
| Central or room air conditioner | About 500 W (small window unit) to 3,000-5,000 W (central) | Hundreds to thousands of kWh | Very high in hot climates | Climate, home size, insulation, efficiency, thermostat setting |
| Electric heating or heat pump | 1,500 W per portable heater; whole-home systems vary | Thousands of kWh in cold climates | Very high where used | Climate, insulation, system type, thermostat setting |
| Electric tank water heater | About 4,500 W element | Often thousands of kWh | High | Household size, tank temperature, insulation, hot water habits |
| Electric shower (UK) | 7,000-10,500 W | Hundreds of kWh | High per minute | Minutes per shower, showers per day |
| Electric clothes dryer | 2,000-5,000 W | Hundreds of kWh | Medium to high | Loads per week, load size, venting, dryer type |
| Oven or range | 2,000-5,000 W | Hundreds of kWh | Medium | Cooking time, how often you cook |
| Refrigerator or fridge-freezer | 100-250 W while running; it cycles on and off | A few hundred kWh | Medium (always on) | Age, size, door openings, room temperature |
| Dishwasher | 1,200-1,800 W | Low hundreds of kWh | Low to medium | Cycles per week, program, heated drying |
| Washing machine | 500-2,000 W (peaks when heating water) | Low hundreds of kWh | Low to medium | Wash temperature, loads per week |
| LED lighting | 5-15 W per bulb | Tens to low hundreds of kWh | Low | Number of bulbs, hours on |
| TV, router, chargers | 5-150 W | Low individually | Low, but adds up | Hours on, standby habits |
Washing Machine, Dishwasher, or Tumble Dryer: Which Uses More?
The dryer almost always uses the most electricity of the three. An electric dryer pulls thousands of watts for a full hour or more, while a washing machine and dishwasher mostly use power to heat water. Heat pump dryers use less than standard electric dryers, but they usually cost more to buy.
Washing on cooler settings and running full loads cuts washer and dishwasher use. Skipping heated dry on a dishwasher helps too. For a dryer, the best saving is to dry fewer loads, or to hang some clothes up.
How to Work Out What an Appliance Costs to Run
Divide the watts by 1,000 to get kilowatts. Multiply by the hours used to get kWh. Multiply by your price per kWh to get the cost. A 2,000-watt appliance running for one hour uses 2 kWh.
Formula: annual kWh = watts ÷ 1,000 × hours used. Annual cost = annual kWh × price per kWh.
Worked example: electric dryer
- Assumptions: 3,000 W, 1 hour per load, 4 loads a week (208 loads a year), $0.17 per kWh (an example rate, so use the one on your bill).
- Energy per load: 3,000 ÷ 1,000 × 1 hour = 3 kWh.
- Annual use: 3 kWh × 208 = 624 kWh.
- Annual cost: 624 × $0.17 = about $106.
Why can the same appliance cost different amounts to run?
Five things change the result: the appliance’s power, its efficiency, how long it runs, how often you use it, and your tariff. A dryer used twice a week costs half as much as one used four times. A time-of-use tariff can make the same load cheaper at night. UK readers can use the same formula with pence per kWh. At an example rate of 25p, a 9,000 W shower used for 8 minutes uses 1.2 kWh and costs about 30p.
Two Homes, Two Different Answers
Home 1: gas heating and hot water. The furnace and water heater burn gas, so they barely touch the electric bill. Here the biggest electricity users are air conditioning in summer, then the fridge, dryer, oven, lighting, and electronics.
Home 2: fully electric. Heating and hot water move onto the electric meter. In a cold climate, heating or a heat pump usually leads, followed by the water heater. Cooling, laundry, and cooking come after. Same size house, completely different top three.
How Can I Find What Is Using the Most Electricity in My Home?
Compare your bills, read your meter at set times, and measure suspect appliances. That three-step method finds the biggest loads in your own home instead of guessing from a generic list.
- Compare periods. Look at your smart meter or utility app. Compare a hot or cold month with a mild one. A big jump points to heating or cooling.
- Check the night baseline. Look at use at 3 a.m. when everyone is asleep. That is your always-on load.
- Plug in a monitor. A plug-in energy monitor shows the watts and kWh of anything that plugs into a normal wall outlet, such as a fridge, TV, or dehumidifier.
- Test one thing at a time. Switch off a suspect item and watch the meter or app.
UK checklist for a high bill
- Compare smart-meter readings between a high month and a low month.
- Check whether electric heating, a heat pump, or an immersion heater is running more than expected.
- Count electric shower minutes per person each day.
- Test always-on loads overnight.
- Measure the fridge-freezer, tumble dryer, and any portable heaters.
- Confirm your tariff and standing charge on your latest bill.
The Centre for Sustainable Energy has a helpful page on how much electricity you are using.
How Much Electricity Do Appliances Use on Standby?
Each device on standby usually draws only a few watts, but they run 8,760 hours a year. Standby is a steady leak, not a flood.
Worked example: assume 10 devices at 5 W each, running 24 hours a day, at $0.17 per kWh. That is 50 W, so 0.05 kW × 8,760 hours = 438 kWh. At $0.17, the cost is about $74 a year. That is real money, but it is smaller than a hot summer of air conditioning or a full year of electric water heating.
Devices that are meant to stay on, like routers, fridges, and smoke alarms, are not waste. Look at game consoles, old set-top boxes, spare TVs, and chargers left in outlets.
What Should I Switch Off or Replace First?
Start with the biggest loads, not the smallest. Savings follow size.
- If cooling or heating leads: adjust the thermostat a few degrees, seal air leaks, and service the system. Replace old equipment only after the cheap fixes.
- If hot water leads: lower the tank temperature to a safe level, insulate pipes, and shorten showers.
- If the dryer leads: dry full loads, clean the lint filter, and line-dry when you can.
- If an old fridge or freezer leads: measure it first. Replacing a very old unit can pay back over time.
- If standby leads: put TVs and consoles on a switched power strip.
Safety: plug space heaters, air conditioners, and similar high-draw items straight into a wall outlet. Never use an extension cord for them. Call a licensed electrician for water heater, dryer, panel, or heat pump wiring.
Solar can offset some use, but plug-in solar rules vary by state and are changing quickly. Check your state and utility before buying. Never bypass a microinverter’s grid shut-off, and use a licensed electrician for any permanent installation. Any solar estimate should state its watts, peak sun hours, system losses, and price per kWh so you can redo the maths.
Frequently Asked Questions
What uses the most household electricity?
Heating, cooling, and water heating, depending on your fuel and climate. In the US in 2020, air conditioning led at 19% of residential electricity use, followed by space heating and water heating at 12% each.
What uses most electricity in home UK?
In gas-heated UK homes, appliances, lighting, and electronics make up most electricity use. In homes with electric heating, heat pumps, immersion heaters, or electric showers, those loads can be the largest.
What household items use the most electricity?
Air conditioners, electric heaters, electric water heaters, electric showers, dryers, ovens, and fridges. Always-on items like routers and chargers use less each, but they run all day.
What uses most energy in house?
Heating, and often hot water, uses the most total energy. The EIA says heating and air conditioning made up 52% of US household energy in 2020, including fuels as well as electricity.
What is using the most electricity in my home?
Compare high and low bill periods, check overnight use, and measure suspect appliances with a plug-in energy monitor. Larger hardwired loads need a smart meter or a whole-home monitor.
Which uses more electricity at home: a dryer or a dishwasher?
An electric dryer usually uses more per use, because it draws thousands of watts for an hour or more. Over a year, the answer depends on how often you run each.
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