The hotels building stock allows to investigate many operative features to improve the effectiveness of energy refurbishment process. S.O.L.E.H. (Sustainable Operation Low-cost Energy for Hotels) project proposed an expeditive tool to facilitate the refurbishment process of hotels in Mediterranean countries, making the hotel building stock more efficient and the tourism industry more competitive. As every simplified energy tool, it must be checked about the consumption and energy saving data, both concerning the in-put and out-put, to validate the tool itself. The paper presents one of the calculation checks carried out by a real case study in Alexandroupolis (Evros, Greece) underling the gap between the data of tool’s simulation and the complete one done with EnergyPlus+®. The work is part of an ongoing research between Italy and Greece aiming to set shared practices and tool to improve the refurbishment process in Mediterranean countries.