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Air conditioners are roughly classified into 9 or 10 ranks, from 6 tatami mats to 26 tatami mats. Most people buy an air conditioner that matches the number of tatami mats. Home appliance retailers and housing companies tell them to "Choose one size larger with a margin of error." However, the people giving the advice have never calculated the load of the room, so they are just giving advice based on guesswork and hearing only. Recently, I and several other people have said in lectures that "the number of tatami mats indicated on air conditioners is too large," and more and more people are saying without any basis that "it's okay if it's small," and spreading it on the Internet. However, I have never seen anyone clearly explain the basis for this. The reason is undoubtedly "because they don't understand it properly." There is almost no accurate and in-depth information about air conditioners in books, papers, or online information. Among them, I have explained the mysteries of air conditioners that I have been unraveling little by little over the past 10 years as detailed and accurate as I can. I don't think there is any more detailed information on the Internet at the moment. If you read this, you will be less likely to waste money when buying an air conditioner in the future. It also reduces the risk of it not working. The most popular slides from hundreds of past lectures are included in this video. It's a little difficult, but please watch until the end.