When it comes to heating appliances in winter, there are the kotatsu and the air conditioner, but some people may be wondering how much difference there actually is in the electricity bills for the two. In this article, we will calculate the electricity bills for using a kotatsu and an air conditioner for 8 hours each, and explain which is more cost-effective. We will also introduce ways to save on heating in the winter, so if you’re concerned about your electricity bills in the coming season, be sure to refer to this article. We will compare the electricity bills for a certain manufacturer’s kotatsu and air conditioner when left on for 8 hours. The electricity bill is calculated using the following formula: ・Kilowatt-hour (amount of electricity consumed) x electricity rate (cost per hour) The electricity rate will be 31 yen/kilowatt-hour, as announced by the National Fair Trade Council for Household Electrical Appliances and Materials (a public interest incorporated association). A kotatsu from one manufacturer consumes 510 watts of power. Therefore, the electricity cost per hour is: ・0.51 kilowatt-hours x 31 yen/kilowatt-hour = approximately 16 yen From this, the electricity bill for using a kotatsu for 8 hours will be approximately 128 yen. Please note that this amount may vary depending on the manufacturer and type of product, so please use it as a guide only. The heating power consumption of a certain manufacturer’s air conditioner is 470 watts. Similarly, the electricity bill is calculated as follows: 0.47 kilowatt-hours x 31 yen/kilowatt-hour = approx. 15 yen. This means that if you run the air conditioner for 8 hours, it will cost you approx. 120 yen. Comparing the two, we can see that there is almost no difference in the electricity bills for a kotatsu and an air conditioner. However, it is important to note that power consumption can vary depending on the heating output, manufacturer, and type of product. How to reduce your electricity bill in winter: The Ministry of Economy, Trade and Industry’s Agency for Natural Resources and Energy’s Energy Conservation Portal Site states that you can save money by paying attention to the following things when using the heating function on your air conditioner. ・Avoid opening and closing doors and windows as much as possible ・Use thick curtains ・Use a fan to circulate the air ・Keep the area around the outdoor unit clean (see links below).
– Avoid opening and closing doors and windows as much as possible – Use thick curtains – Use a fan to circulate the air – Keep the area around the outdoor unit clean A humidifier is also necessary Moderate humidity increases the perceived temperature.
>>1 If you keep heating the kotatsu at 510W, it will get extremely hot. I don’t think it’s right to hide the existence of the thermostat and direct people to the air conditioner.
Turn up the temperature to about 18 degrees with the air conditioner, and then use the kotatsu. Air conditioners and kotatsu are not competing things, they should be used together.
Once the outside temperature drops below 7 degrees, the efficiency of the air conditioner drops dramatically, so it’s a hassle to know what to do at that point.
Even though air conditioners are the most thermally efficient, older people don’t use them because they think that air conditioners are the only electrical appliances that consume a lot of electricity back in the day and they think that the electricity bills are high.
>>31 I know what you mean. It’s gotten a lot colder this week. When I turn on the air conditioner, my throat gets sore. And when I turn on the humidifier, the windows get all sticky.
A 470 watt air conditioner is the average for a 6 tatami room (minimum 160 watts to maximum 1,175 watts), right? The operating capacity at an outside temperature of 2 degrees is 1,140 watts.
Solar energy is the cheapest. I use a vacuum tube to boil water and store it in the bathtub. During the day, I use an aluminum mat from Daiso to guide sunlight into the room.
>>48 The volumes that need to be heated are different to begin with. A kotatsu reheats things faster. This is probably just a stealth marketing ad for the air conditioner.
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