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The present study describes the use of the finite element method to determine the effect of the gypsum board ceiling on room temperature. A simulation of air particles coming from air conditioners is carried out in a large room and the simulation is repeated after providing a gypsum board ceiling in the room, to identify its effect on room temperature. A three-dimensional computer-aided design (CAD) model of a large room with three air conditioners was made and the flow behaviour of air particles is analyzed using ANSYS fluent V15 software. The simulation process is done considering both possibilities, one is which room acts as an open system and the air is allowed to flow through the door of the room and the second as a closed system, in which air flows inside the room only. The analysis is also done with the same model after providing a gypsum board ceiling in the room. The difference generated in room temperature due to the gypsum board ceiling is determined. It is a challenging task to provide a ceiling in the CAD model with different thermal properties than the wall surface. It is necessary to understand the effect of these properties of gypsum on heat transfer in the room. The results suggest that by providing a gypsum board ceiling, a temperature reduction of 3-4 °C can be easily achieved. This reduction in temperature provides thermal comfort for the people living in the room. It also reduces the total cost required for air conditioning.