Umair Gaines
Many household appliances consume a lot of electricity, and these costs can add up quickly. Heating and cooling systems, such as HVAC, are some of the biggest energy consumers, accounting for about 46% of a home's energy consumption. Water heaters, electric showers, and other appliances that use electricity for heating and cooling are also major contributors to high electricity bills. Lighting can also be a significant factor, especially if lights are left on throughout the day, with light bulbs' energy usage varying based on type and usage. Other appliances like refrigerators, washing machines, dryers, ovens, and microwaves can also add to the costs, especially if they are older, less efficient models.
| Characteristics | Values |
|---|---|
| Heating, Ventilation, and Air Conditioning (HVAC) Systems | 28-63 kWh in 24 hours, or 850-1,950 kWh per month |
| Water Heaters | Default temperature of 140°F; reducing to 120°F can save $400 annually |
| Refrigerators | $53 per year to run; older models can cost £49 per year |
| Lighting | Accounts for about 9% of a home's energy use; a 100-watt bulb left on for 2 hours uses 0.2 kWh |
| Computers and Electronics | Laptops use less energy than desktops; TVs, cable boxes, and video game consoles use significant energy in standby mode |
| Kitchen Appliances | Electric kettles use similar energy to a 2 hp motor; microwaves with clock displays always use energy |
| Other Appliances | Dehumidifiers, washing machines, tumble dryers, and electric showers use significant energy |
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What You'll Learn
Heating and cooling systems
In the United States, the average household spends $2,284 on gas and electric energy annually, with $1,691 spent on electricity and $733 on gas. The breakdown of this average shows that around $1,346 is spent on space heaters or air conditioning. Residents of Arkansas, Louisiana, Oklahoma, and Texas spend the most on air conditioning and cooling ($550), while those in New Jersey, New York, and Pennsylvania have the highest expenses for heating ($1,318).
There are several types of heating and cooling systems available, including HVAC units, boilers, and heat pumps. HVAC systems, or Heating, Ventilation, and Air Conditioning systems, are designed to regulate the temperature and air quality in your home. They can be split systems, with an outdoor cabinet connected to indoor air handlers, or packaged systems, where all components are contained in one outdoor unit. Boilers, on the other hand, typically use hot water or steam to provide radiant heating through pipes and radiators installed in the home. Heat pumps, including geothermal heat pumps, are another option that can be used for both heating and cooling, but they may be more expensive to install than a standard air conditioner.
When considering the cost of a heating and cooling system, it's important to factor in the initial purchase and installation expenses, as well as the ongoing energy costs. Electric furnaces are generally more affordable to buy than gas HVAC units, but using gas for heating can result in long-term savings. Additionally, the energy efficiency of the system plays a significant role in both upfront and ongoing costs. Higher-efficiency HVAC units usually come with a higher installation cost but can help reduce energy consumption and lower your utility bills over time.
To make an informed decision, it's recommended to consult with an HVAC professional who can provide quotes for different systems and ensure proper sizing to maximize efficiency and minimize breakdowns.
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Water heaters
There are two main types of water heaters: traditional storage tanks that heat and store water, and tankless systems. The default setting on most water heaters is 140 degrees Fahrenheit, but the Department of Energy recommends reducing this to 120 degrees, which could save you $400 per year. You can also save energy by taking shorter showers, using low-flow showerheads, and washing laundry in colder water. Insulating your water heater tank can also help, especially in cold weather.
If you're looking to save on your electricity bill, consider switching to a heat pump ("hybrid") water heater, which can reduce your electricity use for water heating by a factor of three. Alternatively, you could switch from an electric water heater to a gas one, which is more cost-effective in the long run due to the higher cost of electricity compared to natural gas.
You can also save on your water heating costs by switching to a cleaner energy plan, such as one backed by solar and wind power. This will not only reduce your carbon footprint but also your everyday costs.
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Lighting
The amount of electricity used by a light bulb depends on the type of bulb, the wattage, and how long it is on for. Incandescent bulbs use more electricity than modern LED bulbs. For example, a 60-watt incandescent bulb uses 0.06 kWh of electricity if left on for an hour, amounting to 0.48 kWh for 8 hours, or 14.4 kWh in a month. In contrast, a typical LED bulb is 8 watts, using 0.008 kWh of electricity per hour.
To calculate the cost of running a light bulb, you can multiply the wattage by the number of hours it is on per day, then divide by 1000 to get kilowatts, and finally multiply by the cost of electricity per kilowatt-hour. The average cost of electricity is around $0.14 per kilowatt-hour. So, leaving a 60-watt incandescent bulb on for 8 hours a day would cost around $0.86 per month. In comparison, an 8-watt LED bulb would cost around $0.15 per month for the same usage.
To reduce electricity usage and costs associated with lighting, you can replace old incandescent bulbs with modern LED bulbs, which use about one-tenth of the energy. Additionally, you can be mindful of how many lights are turned on and for how long, especially if you have many lights throughout your house.
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Fridges
The amount of electricity a fridge uses depends on several factors, including its age, make, model, and location in your home. The amount of food stored in the fridge can also impact its energy consumption. A standard refrigerator/freezer combo typically uses between 300 and 800 watts of electricity, but it's important to note that fridges generally have a lower "running" wattage than their stated average wattage. This is because they cycle on and off throughout the day. To estimate the actual energy usage of your fridge, you can divide its rated wattage by three. For example, a 500-watt refrigerator will use around 150 to 175 watts most of the time.
You can reduce your fridge's electricity consumption by ensuring it is energy efficient. Clean the condenser coils regularly, as dirt buildup forces the fridge to work harder, increasing energy usage and reducing its lifespan. Keep your refrigerator three-fourths full, as it is more efficient to maintain the temperature when there is more food inside, but still allow for good air circulation.
Smart fridges, such as those with an ENERGY STAR® rating, can also help you monitor and control your energy usage. These units tend to be pricier, but they use energy more efficiently and often include features to track your actual energy consumption.
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Computers
Laptops, for example, use less energy than desktop computers, so opting for a laptop when purchasing a new device can help reduce energy consumption. Additionally, utilizing power-saving features such as "sleep mode" and automatic power-saving settings can make a significant difference. Smart power strips are another useful tool as they prevent electronics from drawing power when not in use, a phenomenon known as "vampire power." Similarly, unplugging chargers once your laptop is charged can help reduce wasted energy.
In the US, it is estimated that 50% of personal computers are left on overnight, resulting in an annual energy waste of 28.8 billion kWh, costing $2.8 billion per year. User behavior differs in Europe, with approximately 28% of PCs left on overnight in the UK and 30% in Germany. These differences in user behavior result in varying levels of energy waste, with the UK wasting 2.5 billion kWh and Germany wasting 4.8 billion kWh annually.
The energy consumption of computers extends beyond just the devices themselves. The production and operation of information and communication technology (ICT) require significant energy expenditure. In 2020, the ICT sector, including data centers, networks, and user devices, consumed about 915 TWh of electricity, or 4-6% of all electricity used worldwide. This is comparable to the energy consumption of 86 million typical American homes. The energy demand of the ICT sector is projected to reach 3,200 TWh by 2030, surpassing the estimated electricity demand for powering all electric vehicles in the world by 2050.
The rise of new technologies, such as cryptocurrency and artificial intelligence, has further increased energy demand. Cryptocurrencies, for example, rely on energy-intensive blockchain technology, contributing to the growing energy consumption of the ICT sector. As the world moves towards decarbonization and renewable energy sources, managing energy demand and improving energy efficiency in the ICT sector will become increasingly crucial.
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Frequently asked questions
Heating and cooling systems, such as HVAC, are the biggest energy suckers, accounting for about half of a home's electricity consumption.
Water heaters for showers, baths, dishes, and laundry are another top electricity cost.
Wet appliances in the bathroom, such as washing machines, showers, and tumble dryers, account for about 16% of a typical energy usage bill. Other appliances that use a lot of electricity include ovens, electric kettles, microwaves, and refrigerators.
Lighting uses a significant amount of electricity, especially if the lights are on most of the day. Lighting accounts for about 9% of a typical home's energy use. Electronics such as televisions, cable boxes, and video game consoles can also use a significant amount of energy, especially when left on standby.
