An analysis of questionnaire survey result of heating apparatus use in Japan has been presented. It has been found out that there are many bcombinations of heating apparatus. 85% person who uses air conditioner as heater uses other heating apparatus together such as with electric warm carpet. How much time the air conditioner has been used in a day depends on the kind of the other heating apparatus used together. It has been found that more than 80% person who uses air conditioner and floor heating system uses air conditioner only for 1.5 hours a day.
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