Due to exposure to direct sunlight, rooftop PV panels often suffers from heating. Performance of monocrystalline photovoltaic (MCPV) cell/panel is affected by its thermal properties, therefore, this research aims to measure the performance of MCPV through 2-dimensional heat mapping to determine the most efficient cooling scheme for the PV to maintain its most optimum performance. The measurement, mapping, and calculation is conducted on an array of experimental rooftop PV panel installed on a building, heat mapping data is taken from 55 points on PV surface. Measurement result shows that the high temperature of the MCPV panel is around 58,6oC - 64,7oC. Based on the results, the recommendation of temperature sensor placement for the cooling process is located at point 23 and 47.