Building integrated photovoltaic (BIPV) facades are a solution to consider when it comes to electricity generation on the building site. One of the main challenges attributes to this technology is finding the best trade-off between the electrical efficiency of BIPVs and the energy use of the building. This study aims to identify a scenario that yields the optimized results for electrical and thermal performance in a test building. Among the scenarios, the original wooden cladding in the test building is either replaced with PV panels or the PV modules are added to the existing facade. Rhinoceros 3D CAD software and its visual programming plugin Grasshopper are used to perform various simulations for both east-oriented and west-oriented façades with low and high thermal inertia wall structures. Although a complex flow phenomenon behind BIPVs is simplified in the 3D heat transfer model, relatively reliable results are obtained using the chosen simulation tool. It is observed that the east-faced BIPV facade in the test building has higher electrical efficiency. This could be attributed to the lower inertia of the east wall that allows easier propagation of heat through the structure.