Abstract: This paper was purposed to examine the comparison of the potential of coco fiber as a wall insulation of buildings in reducing heat based on the character. For the fulfillment of thermal comfort in buildings requires engineering, knowledge and skills and innovation. One way to reduce the hotter air inside the room can be done through the wall so as to reduce the use of air conditioning. The walls need protection and dampening of the suns heat that can make the room inside the building has thermal comfort. Based on this, it is necessary to conduct research on natural materials that can function in reducing heat through the wall of the building.