To improve the living comfort and energy conservation in next-generation housings, actual measurements of thetemperature and humidity in the summer, and a questionnaire survey of physical sensation were conducted. The survey was conducted in a high airtight and high insulation house which introduced radiant cooling and heating systems located in Honjo City, Saitama. Similar questionnaire surveys were also conducted in the neighboring commercial facilities for comparison. As a result of simple estimation of PMV (Predicted Mean Vote), we confirmed that the comfort of the evaluation target housing is excellent. In addition, we examined the relationship between the temperature and humidity and the power consumption by HEMS (Home Energy Management System) for the purpose of obtaining guidelines for energy conservation.