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This paper focuses on the system identification of the thermal dynamics of a domestic dwelling and the aim of the modelling process is to design an efficient control scheme that minimises energy usage and, consequently, fuel bills. Existing software packages for thermal modelling of structures are based on physical models or finite element analysis and use real data for comparative purposes only. In contrast, in this study a wireless sensor network was used to measure actual temperature variations and this data was used to identify a process model. By successfully twinning wireless technology and system identification techniques, an overall model structure of the heat characteristics of a domestic residence is presented in this paper.