In the framework of the TriSolHP project, aimed at estimating the impact of improved heat pump technologies for decarbonization of non-retrofitted multifamily buildings in urban districts, a new type of PVT WISC (a photovoltaic-thermal wind and/or infrared sensitive collector) has been extensively tested in a climatic room without light input. The measurement campaign focused on the impact of airflow over the collector heat transfer coefficient for different installation layouts and when covered in ice. Measurement data were compared to TRNSYS simulations to gain an insight over the uncertainties affecting the performance models available in literature for this type of WISC.