What Home Devices Cost You the Most on Your Power Bill?

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Luxury in life comes at a cost. As you try to make your life better, you inevitably find yourself adding more energy consuming appliances to your home. Gone are the days when electricity only served the purpose of lighting homes. Today, it's all about controlling the entire ecosystem in your home. You need appliances that reduce household chores such as dishwashing and laundry.

You also need devices that regulate room temperature, improve the shelve life of your foods, and offer entertainment. Many are the devices that the average city dweller uses across the globe. Americans are number one on the heavy spenders' list when it comes to energy consumption. In this guide, we will be looking at some of the most expensive electric appliances and how you can save on electricity.

Electricity Consumption Versus Appliance Use

Before we start looking at the numbers, it's critical to mention that the cost of electricity primarily relies on two factors; the appliance's energy consumption rate and the usage time. Some devices consume energy in a passive mode. These are more dangerous and costly to maintain.

Most electric appliances have an indication of their power consumption in watts. All the figures outlined in this document are calculated from a personal perspective based on the wattage of most home appliances. You can do a simple calculation of your power expenditure at home and determine which appliance consumes the most electricity.

How To Calculate The Electricity Consumption Of An Appliance

Since all devices are rated in watts, you need to determine the amount of electricity you use by multiplying the wattage with the number of hours you use the appliance in a day. For instance, if your bulb is rated 50 watts and it has to be on for the entire day, it consumes 24 x 50 =1200 watt-hour.

Since electricity is billed in kilowatt-hours, you must divide this figure by 1000 which will give you 1.2 kWh. According to the NRP, the average cost of electricity in the US is 13 cents per kWh. This would mean that using your 50-watt bulb for the whole day should cost you about 0.13 x 1.2 = $0.144.

We will be using this formula to calculate the possible cost of appliances. On this list, I have only picked the devices that are common across all households and the ones that consume the most power according to personal calculations. The devices on the list are not ranked in any order.

Electric Water Kettle

Electric kettles are very handy when it comes to boiling water and making quick coffee. As much as they are effective, they are also among the most expensive devices to maintain. An electric kettle wattage ranges between 1000 and 1800 watts. Let's work with an average of 1400 watts for our calculations. Such a kettle can boil water in just 4 minutes but others may take as long as 20 minutes.

Assuming that you only have to boil water twice in a day, the average time spent on the electric tale would be roughly 20 minutes. The cost of using an electric kettle for a day would then be (20/60 x 1400)/ 1000= 0.46662 kilowatt-hours. To get the amount, simply multiply the kilowatt-hour of your kettle with the kilowatt-hour rate of your local state. For this case, the cost of using your kettle for 20 minutes each day at the rate of 13 cents per kWh would be $0.13 x 0.46662 x 365= $ 22.14

kitchen with ovens and refrigerator

Fridge and Freezer

The freezer is another appliance that consumes the most power at home. The case is made worse by considering the fact that it has to be functional most of the time. Unlike the kettle, the freezer may be required to operate round the clock. On average, freezers rate between 200 and 350 watts. Working with an average value of 50 watts, a freezer running for 24 hours would cost (24 x 250)/ 1000 = 6 kilowatt-hours. At the rate of 13 cents per kilowatt-hour, the annual cost for running a freezer would be 6 x 0.13 x 365 = $284.7 However, this cost is just an approximate, considering that you do not have to keep your freezer on 24 hours a day.


Dishwashers are rated between 1200 and 2400 watts. The cost of running your dishwasher depends on how often you use it. A dishwasher running for an hour a day should translate to (1 x 1800)/1000 =1.8 kilowatt-hour. This cost translates to 1.8 x 0.13 x 365 = $85 per year. This is a relatively high cost for running one appliance. To reduce the cost, you can buy a lower-rated dishwasher, preferably between 1200 watts and 1600 watts.

Large screen TV

TVs have never been a problem when it cons to power usage. However, with the dawn of large-screen TVs, it is becoming necessary to monitor their power usage. The average wattage of a large flat screen TV is 300 watts. Unfortunately, a TV has to run for long hours. Some people use their TVs for about 24 hours a day, while others only watch for an hour. Using an average watch time of 5 hours, the kilowatt rating of your TV should be ( 5 x 300)/1000= 1.5 kilowatt-hours. The average annual cost for running your plasma 5 hours a day would be 1.5 x 0.13 x 365 = $71.2

deskop computer on a clean desk with books and plants and coffee

Desktop PCs

Desktops are among the passive electricity consumers. Passive consumers mainly include appliances that use power even when they are not actively functioning. The average wattage for a 22 LCD monitor and CPU is 250 watts. Assuming that your PC remains running round the clock, the kilowatt-hour consumption of the PC would be (24 x 250 ) /1000= 6 kWh.

An example electricity expenditure on your PC per year might be be 6 x 0.13 x 365 = $284.7. In this case, the assumption is that your PC runs around the clock. Even when it is switched off, the PC will consume power as long as it is connected. Disconnecting your PC from the socket can save up to 90% of the cost. Switching to a laptop can also help reduce the power cost significantly.

Home Heating and Cooling Systems

Home heating and cooling systems are the largest power consumers. In an average home, the AC runs for about 9 hours a day. Given that ACs are rated between 3000 and 5000 watts, they are consequently the giant power spenders at home. Let's try to calculate the cost of running your AC for 9 hours a day. We will use the average rating of 4000 watts for the AC. kWh consumption will be around (4000 x 9)/ 1000= 36 kWh at the time of this writing.

The Annual cost will be 36 x 0.13 x 365= $ 1708.2. This means that your home AC is the ultimate power spender and should be controlled. You can reduce the power expenses by reducing the running time of your AC to about 3 hours a day.


These are just but some of the products that consume more power at home. The best way to determine the appliance that drains your energy is to carry out an individual analysis. Just determine the number of hours the appliance has to run in a day. Multiply the hours by the wattage and divide the product by 1000 to get its kilowatt-hour rating. You can now multiply by the kilowatt-hour cost in your region.