To investigate the students’ understanding of heat transfer which emphasized the process of heat transfer and thermal properties of materials, students were asked to predict the temperatures of metal and plastic chairs which are in the same room. Nearly 30% of the students thought that the metal objects feel colder than the plastic objects because they were heavier, 7% of the students thought that temperature was a property of a particular material or object, 24% of the students thought that metal had less heat to lose than plastic. Another 20% of the students tried to explain that metal objects are colder than the plastic ones because they could absorb heat more than plastics did. Just only 8% of the students held correct understanding that really materials both metal and plastic chairs were in the same surroundings. They were at the same temperature. By changing the situation, the students were asked to predict the temperature of aluminium and wood strips which were put in the truck in the hot day. Forty three percent of the students thought that metal was hotter than wood because metal held heat better than wood did and 29% of the students thought that the metal could radiate heat better than wood did. However, 20 % of the students held correct understanding that the metal could conduct heat energy from their hands faster than wood did.