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This paper presents the results of a demonstrative Building Integrated Photovoltaic (BIPV) installation in Lugano where five BiPV modules with different integration solutions (fully integrated as Double Glaze Units (DGUs) and ventilated), different inclinations (30° and 90°) and different technologies (double junction amorphous silicon (a-Si/a-Si) and crystalline silicon (c-Si)) were investigated. The paper aims at evaluating the impact of the operating cell temperature on the modules’ performance for different investigating cases. Two models were used to calculate the junctions’ temperatures of the modules under operation: the simplified Nominal Operating Temperature (NOCT) model and the Equivalent Cell Temperature (ECT). The first was used in a simplified version and the second was used for all modules, regardless of its limitations for thin film technologies. The two models agree well and give satisfactory results …