System for the heating and maintenance in temperature of road pavements, comprising: - temperature detection means (2, 3, 4) which are associated with a road pavement and configured to detect at least one value of surface temperature (Ts); - at least a first buried exchanger assembly and comprising at least a first heat-carrying fluid adapted to exchange heat with the subsoil; - at least a first detection sensor associated with said first exchanger assembly and configured to detect a first offset temperature (T'c) of said first heat-carrying fluid; - a transmission circuit (19, 20) of the heat connected to said at least one first exchanger assembly and to said pavement, said at least one first heat-carrying fluid flowing inside said transmission circuit (19, 20) and being able to exchange heat with said pavement; characterized by the fact that it comprises: - at least a second exchanger assembly comprising at least a second heat-carrying fluid; - at least a second detection sensor associated with said second exchanger assembly and configured to detect at least a second compensation temperature (T"c) of said second heat-carrying fluid; wherein said transmission circuit (19, 20) comprises mixing means connected to said second exchanger assembly and activatable to allow the mixing of said first heat-carrying fluid with said second heat-carrying fluid; and by the fact that it comprises at least one processing and control unit operatively connected to said detection means (2, 3, 4), to said first detection sensor, to said second detection sensor and to said mixing means and, in turn, comprising at least one storage unit of at least one lower temperature limit value (L I) and/or one upper temperature limit value (Ls), said processing and control unit being configured to command said transmission circuit (19, 20) to maintain said surface temperature (Ts) between said lower limit value (Li) and said upper limit value (Ls). - temperature detection means (2, 3, 4) which are associated with a road pavement and configured to detect at least one value of surface temperature (Ts); - at least a first buried exchanger assembly and comprising at least a first heat-carrying fluid adapted to exchange heat with the subsoil; - at least a first detection sensor associated with said first exchanger assembly and configured to detect a first offset temperature (T'c) of said first heat-carrying fluid; - a transmission circuit (19, 20) of the heat connected to said at least one first exchanger assembly and to said pavement, said at least one first heat-carrying fluid flowing inside said transmission circuit (19, 20) and being able to exchange heat with said pavement; - at least a second exchanger assembly comprising at least a second heat-carrying fluid; - at least a second detection sensor associated with said second exchanger assembly and configured to detect at least a second compensation temperature (T"c) of said second heat-carrying fluid; wherein said transmission circuit (19, 20) comprises mixing means connected to said second exchanger assembly and activatable to allow the mixing of said first heat-carrying fluid with said second heat-carrying fluid; and by the fact that it comprises at least one processing and control unit operatively connected to said detection means (2, 3, 4), to said first detection sensor, to said second detection sensor and to said mixing means and, in turn, comprising at least one storage unit of at least one lower temperature limit value (L I) and/or one upper temperature limit value (Ls), said processing and control unit being configured to command said transmission circuit (19, 20) to maintain said surface temperature (Ts) between said lower limit value (Li) and said upper limit value (Ls).