Buzz
Homes account for 40% of electricity consumption in the U.S. Alvaro Medina Jurado / Getty ImagesEnergy consumption is typically measured in kilowatt-hours (kWh), with one kWh representing 1,000 watts operating for an hour.
In 2022, the U.S. utilized 4 trillion kWh of electricity, with households consuming 1.42 trillion kWh. This means nearly 40% of the nation's electricity powers homes, surpassing usage in both commercial and industrial sectors.
What drives the massive energy consumption in the residential sector? The answer lies in home appliances, which consume substantial amounts of power. For instance, a 1,000-watt appliance running for an hour consumes 1 kWh of electricity. So, which appliances are the biggest energy consumers in a household?
5. Lighting
Lighting makes up 4.4% of residential energy use, ranking it as the fifth-largest energy consumer in homes. The positive aspect? Modern LED bulbs are far more energy-efficient compared to traditional incandescent and even CFL bulbs.
Replacing incandescent bulbs with energy-saving LED alternatives is an effective strategy to cut down on energy costs and lower your home's overall energy usage. Additionally, consider using motion-sensor lights for outdoor security instead of keeping them on all night.
Using timers for your light bulbs can also help prevent accidentally leaving lights on when they're not needed.
4. Refrigerators and Freezers
Look for a power-saver switch on your refrigerator. If turning it off doesn’t cause condensation, you likely don’t need this feature.
Photo courtesy of U.S. CPSCRefrigerators are the top energy-consuming kitchen appliances. The exact energy usage varies by model. In 2023, Energy Star-certified fridges ranged from 88 kWh/year for compact models to 807 kWh/year for larger 31-cubic-foot (0.88 cubic-meter) smart refrigerators.
Energy ratings for appliances can vary widely. Some households still use refrigerators from the 1980s or earlier, which consume thousands of kWh annually, leading to significantly higher electricity bills.
A modern, high-efficiency refrigerator might use around 400 kWh/year. Other factors influencing energy use include the model’s size, freezer placement (top freezers are more efficient), temperature settings, location, usage habits, and available energy-saving features (which we’ll discuss further).
No matter what refrigerator model you own, there are ways to cut down its energy consumption (though if your fridge or freezer is over 15 years old, upgrading to a new, energy-efficient model is the best step if financially feasible):
- Look for a power-saver switch. Certain refrigerators include in-door heaters to minimize condensation. If you find a "power saver" switch, activate it. If condensation doesn’t appear afterward, the feature isn’t necessary.
- Adjust the thermostat. The optimal temperature for refrigerators is 40 degrees Fahrenheit (4 degrees Celsius), while freezers should be set to 0 degrees Fahrenheit (-18 degrees Celsius).
- Defrost regularly. Frost buildup exceeding 0.25 inches (0.64 cm) reduces efficiency.
- Inspect the door seals. Place a piece of paper in the door; it should stay firmly in place. If it doesn’t, the seal needs replacement.
- Adopt efficient refrigeration practices. Label food for easy access, let hot food cool before storing, and plan what you need before opening the door.
3. Water Heating
The U.S. Department of Energy reports that water heating accounted for 11% of residential energy use in 2020. Water heaters are essential for various daily tasks, including showers, dishwashing, and laundry, making them a constant presence in our routines.
With an average monthly consumption of 400 kWh, water heating is also a significant energy drain.
The energy used for hot water depends on several factors, such as the type (standard, solar, or tankless) and size of your water heater, the temperature setting, shower duration, and whether you use hot or cold water for laundry. Regardless of your water heater model, there are steps to enhance its efficiency:
- Adjust the thermostat. A setting of 120 degrees F (50 degrees C) is usually sufficient.
- Insulate the hot water tank and the first 6 feet (1.8 meters) of connected pipes to prevent heat loss during storage and transport.
- Drain a quart of water every three months to reduce sediment buildup, which can impair efficiency.
- Consider installing a drain-water heat recovery system to reuse energy from wastewater.
- Shorten shower times.
- Opt for cold or cool water when washing clothes.
- Disable the dishwasher’s "water heat" feature.
2. Space Heating
Upgrading to a programmable thermostat can help conserve energy.
Photo courtesy of Energy StarHome heating systems are among the most energy-intensive appliances, yet they are also one of the most essential.
The energy consumption of heating systems varies widely, ranging from a modest 100 kWh per month to an astonishing 3,500 kWh/month (especially in colder regions, where high energy bills are common). This variation depends on the type of heating system and the efficiency of the specific model.
Below are approximate energy usage figures for different heating systems:
- Baseboard unit: 100-500 kWh/month
- Portable heater: 200-300 kWh/month
- Heat pump: 900-2,000 kWh/month
- Electric furnace: 1,500-3,500 kWh/month
Additional factors include thermostat settings and whether a programmable thermostat is used to minimize energy waste.
The most effective way to lower heating-related energy consumption is to upgrade to a more efficient unit. Some modern furnaces achieve up to 97% efficiency, compared to older models that may only operate at 78% efficiency.
Without investing in costly upgrades, you can still improve your system’s efficiency and reduce energy consumption by:
- Switch to a programmable thermostat.
- Ensure the thermostat is placed away from heat or cold sources that could affect its accuracy.
- Set the thermostat to the lowest comfortable temperature.
- Seal and insulate your home’s ductwork.
- Keep vents clear of obstructions.
- Change filters on a regular basis.
One of the simplest habits to adopt: If you feel chilly, just grab a sweatshirt.
1. Air Conditioning
In 2020, nearly 88% of U.S. households relied on air conditioning [source: EIA]. Air conditioners, which often operate high-wattage systems for long durations, contribute significantly to residential energy consumption.
The energy consumption of cooling a home varies significantly based on the type of air-conditioning unit, its capacity, operating duration, and efficiency rating. Monthly usage can range from 200 to 1,800 kWh.
To enhance the efficiency of your air conditioner, consider the following steps:
- Schedule annual professional maintenance. Ensuring proper fluid levels, coolant charge, and insulation is essential for optimal performance.
- Close vents in rarely used rooms.
- Install a programmable thermostat to automatically turn off the AC when outdoor temperatures drop.
- Ensure your attic has at least 16 inches (41 centimeters) of insulation to reduce heat penetration and ease the AC’s workload.
You might also consider upgrading to a more efficient model or, alternatively, embracing a bit of warmth as a natural part of life.
How to Calculate Energy Usage
Calculate the daily kWh consumption of an appliance using this formula:
The wattage can typically be found on the appliance’s nameplate.
Alternatively, use a watt meter such as Kill A Watt for accurate measurements.
