This study intends to clarify real usage of equipment and energy consumption in a residential house. This study researches a large number of households in 3 major cities via internet. This paper, as an interim report of the study, shows the purpose of the study, the methods, the characteristics of sample households, and real usage and conformability of heaters. This paper shows that a floor heating system has higher conformability and an air conditioner is used with higher temperature than a fan heater. The next paper will report a relation between usage of equipment and energy consumption.