In recent years, there are many consumer electronics in our life. so, our life became more comfortable than the past. Do you know an air conditioner? It is air condition. We can't endure the heat in a day on which the temperature goes above 30 degrees. Moreover, we sweated profusely. But, if we have an air conditioner, we can spend comfortable time in hot summer. In 1902, the first electricity air conditioner was invented by Willis Carrier in Syracuse. In the 1950s, it sold like hotcakes in American. Also, there are many businesses function it present day trend. For example, an air purifier and humidifier, negative air ionization therapy. Now, there are many exclusive air conditioners of businesses. So, air conditioner is very useful to life.
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