A method of control for thermal and pneumatic performance of an air curtain arranged on an interior side of a door opening in horizontal position above a door or in the vertical position next to the door and equipped with a control system for the operation of the thermal and pneumatic performance of the air curtain , which is interconnected with at least one interior detector of infrared radiation, characterized in that the control is performed in the following steps: a) the detector of infrared radiation detects infrared radiation reflected at an angle of α ranging from 5° to 80° to the normal line of the reflecting surface on the interior side , b) first of all, the detector of infrared radiation measures the spectral specific radiant intensity of infrared radiation M λs [W/cm 2 μm] from the reflecting surface on the interior side with the door closed, c) then the detector of infrared radiation measures the spectral specific radiant intensity of infrared radiation M λs [W/cm 2 μm] reflected from the reflecting surface on the interior side with the door opened, or the detector measures the spectral specific radiant intensity of infrared radiation M λs [W/cm 2 μm] reflected at an angle of α ranging from 5° to 80° to the normal line of the exterior measured reflecting surface positioned on the floor in the area of the door opening on its exterior side with the door opened, d) then the values measured in step c) and b) are compared and their difference Δ M λs is ascertained within the range of the analog or digital output of the detector of infrared radiation that characterizes the change in the spectral specific radiant intensity of infrared radiation Δ M λs [W/cm 2 μm] emitted and reflected by the surface of the measured reflecting surface , e) the difference Δ M λs determined according to step d) as a difference of temperature conditions between the interior and the exterior is compared in the control system with the required value that is preset in the control system , and an up-to-date correction of the thermal and pneumatic performance and setting the air flow direction of the air curtain is performed. a) the detector of infrared radiation detects infrared radiation reflected at an angle of α ranging from 5° to 80° to the normal line of the reflecting surface on the interior side , b) first of all, the detector of infrared radiation measures the spectral specific radiant intensity of infrared radiation M λs [W/cm 2 μm] from the reflecting surface on the interior side with the door closed, c) then the detector of infrared radiation measures the spectral specific radiant intensity of infrared radiation M λs [W/cm 2 μm] reflected from the reflecting surface on the interior side with the door opened, or the detector measures the spectral specific radiant intensity of infrared radiation M λs [W/cm 2 μm] reflected at an angle of α ranging from 5° to 80° to the normal line of the exterior measured reflecting surface positioned on the floor in the area of the door opening on its exterior side with the door opened, d) then the values measured in step c) and b) are compared and their difference Δ M λs is ascertained within the range of the analog or digital output of the detector of infrared radiation that characterizes the change in the spectral specific radiant intensity of infrared radiation Δ M λs [W/cm 2 μm] emitted and reflected by the surface of the measured reflecting surface , e) the difference Δ M λs determined according to step d) as a difference of temperature conditions between the interior and the exterior is compared in the control system with the required value that is preset in the control system , and an up-to-date correction of the thermal and pneumatic performance and setting the air flow direction of the air curtain is performed. <EOS>