Installation for treating objects having a) a device for temperature control of the objects, in which a temperature control tunnel is accommodated in a housing, which tunnel comprises at least one air outlet and at least one air inlet; wherein b) the temperature control tunnel being assigned at least one heating unit, in which a hot primary gas flow can be generated; c) the hot primary gas being leadable into a circulating air heat exchanger, in which air from the temperature control tunnel can be heated by hot primary gas and can be fed back to the temperature control tunnel as circulating air in a circuit via the at least one air inlet; d) the heating unit is coupled in the manner of a combined heat and power unit to an electric generator in such a way that electrical energy is generated during the operation of the heating unit; e) means (52, 54) are provided, by means of which tunnel atmosphere can be sucked out of the temperature control tunnel as exhaust air; characterized in that f) exhaust air can be supplied at least partly to a burner of the heating unit in the form of combustion air; g) a mixing unit is provided, by means of which the exhaust air can be enriched with oxygen O 2; h) an electrolysis unit is provided, in which oxygen O 2 can be electrolytically produced and can be supplied to the mixing unit; i) electrical energy required for the electrolysis in the electrolysis unit is generated at least partly by the generator; j) a Sabatier reaction unit is provided, in which a Sabatier reaction can be carried out; k) an electrolysis of water can be carried out by means of the electrolysis unit; I) the electrolysis unit is linked to the Sabatier reaction unit; m) hydrogen H 2 produced in the electrolysis of water being leadable to the Sabatier reaction unit and/or water H 2 O produced in the Sabatier process being leadable to the electrolysis unit. a) a device for temperature control of the objects, in which a temperature control tunnel is accommodated in a housing, which tunnel comprises at least one air outlet and at least one air inlet; b) the temperature control tunnel being assigned at least one heating unit, in which a hot primary gas flow can be generated; c) the hot primary gas being leadable into a circulating air heat exchanger, in which air from the temperature control tunnel can be heated by hot primary gas and can be fed back to the temperature control tunnel as circulating air in a circuit via the at least one air inlet; d) the heating unit is coupled in the manner of a combined heat and power unit to an electric generator in such a way that electrical energy is generated during the operation of the heating unit; e) means (52, 54) are provided, by means of which tunnel atmosphere can be sucked out of the temperature control tunnel as exhaust air; f) exhaust air can be supplied at least partly to a burner of the heating unit in the form of combustion air; g) a mixing unit is provided, by means of which the exhaust air can be enriched with oxygen O 2; h) an electrolysis unit is provided, in which oxygen O 2 can be electrolytically produced and can be supplied to the mixing unit; i) electrical energy required for the electrolysis in the electrolysis unit is generated at least partly by the generator; j) a Sabatier reaction unit is provided, in which a Sabatier reaction can be carried out; k) an electrolysis of water can be carried out by means of the electrolysis unit; I) the electrolysis unit is linked to the Sabatier reaction unit; m) hydrogen H 2 produced in the electrolysis of water being leadable to the Sabatier reaction unit and/or water H 2 O produced in the Sabatier process being leadable to the electrolysis unit.