 The increasing use of smart technology has led to greater interest in energy conservation measures, ECMs, which are becoming more accurate due to advances in energy software and computing power. However, the accuracy of ECMs must still be verified using calibration procedures, which involve measuring the performance of the model against real-world data. Several organizations have developed guidelines and methodologies for this purpose, including ASHRAE Guideline 14-2014, IPMVP, and FEMP. These guidelines identify common errors that may lead to a false sense of confidence in the accuracy of the model. The article discusses these errors and how they can be avoided. This article was authored by German Ramos Ruiz and Carlos Fernandez Bandera.