Air temperature in Bandung increases every year according BMKG's 2014 data. It affects to thermal comfort inside houses. To overcome this situation, people tend to use air conditioning as an instant alternative, wheares the air conditioning will increase the daily operating cost it's user. In this research, passive technique as an alternative method is used by choosing wall material which is capable in reducing the outside temperature. Foam concrete is selected as a wall material and will be compare to brick. Temperature, humidity, and wind speed are researched and analized to value the effectiveness as each wall materials of a thermal insulation. out comes of the research can be an alternative in minimalizing the operational cost of electricity while using AC.