instruction cl is sent to the thermal regulation system 10 in the case of the heating system the limitation instruction cl is in this case a decrease instruction by which the thermal regulation system 10 regulates the temperature t of the built structure b down the invention functions in a mode known as u201c free u201d also called u201c free intermittence u201d i e the lowest attainable temperature t is attained during each absence the limitation instruction cl may integrate an instruction temperature or not the limitation instruction cl may consist of either diminishing the power of the thermal regulation system 10 or interrupting it completely enabling a faster drop in temperature t in all cases it will be evident that the limitation instruction causes a drop in energy consumption of the thermal regulation system 10 and therefore of the built structure b the invention further provides a hold instruction cm in the event where the temperature t of the built structure b reaches an extreme temperature te see fig4 the extreme temperature is generally set by public protection agencies typically it may be a minimum temperature of 8 u00b0 c in france at his convenience the user may decide in advance which extreme temperature te to choose or choose to let the data processing module 22 determine it typically the limitation instruction cl may include an instruction temperature equal to the extreme temperature te in a third step c geolocation of the user u is performed in a first part c 1 in a second part c 2 the return travel time u03b4tr of the user u is estimated as a.