Optimum finishing position, thickness and phase change temperature of winter and summer season were selected and suitability of finishing materials was evaluated based on temperature measurement of specimens applying the coating material mixed phase change materials(PCM). As a result, when finishing position was interior and finishing thickness of coating material mixed n-Octadecane(28 ℃PCM) was 4mm, thermal performance was effective. n-Octadecane in summer season and n-Hexadecane(18 ℃PCM) in winter season are indicated effective on energy savings, respectively.