An electronic device rack, comprising: a plurality of panels (10a to 10c) surrounding a first space; an electronic-device housing unit disposed in the first space and configured to house an electronic device; a heat exchanger disposed in the first space at a position away from the electronic-device housing unit; a second space provided between the electronic-device housing unit and the heat exchanger and isolated from the rest of the first space; and an air blower configured to circulate air inside the first space through the electronic-device housing unit, the second space, and the heat exchanger in the described order, characterized by: a first temperature sensor configured to detect a temperature of the air before passing through the heat exchanger; a second temperature sensor configured to detect a temperature of the air after passing through the heat exchanger; and a controller configured to control the air blower according to the temperatures detected by the first temperature sensor and the second temperature sensor, wherein the controller is configured to control the air blower to maintain a rotational speed of the air blower in a case where a difference between the temperatures detected by the first temperature sensor and the second temperature sensor is equal to or above a predetermined value, and to control the air blower to lower the rotational speed of the air blower in a case where the difference between the temperatures detected by the first temperature sensor and the second temperature sensor is below the predetermined value. a plurality of panels (10a to 10c) surrounding a first space; an electronic-device housing unit disposed in the first space and configured to house an electronic device; a heat exchanger disposed in the first space at a position away from the electronic-device housing unit; a second space provided between the electronic-device housing unit and the heat exchanger and isolated from the rest of the first space; and an air blower configured to circulate air inside the first space through the electronic-device housing unit, the second space, and the heat exchanger in the described order, characterized by: a first temperature sensor configured to detect a temperature of the air before passing through the heat exchanger; a second temperature sensor configured to detect a temperature of the air after passing through the heat exchanger; and a controller configured to control the air blower according to the temperatures detected by the first temperature sensor and the second temperature sensor, wherein the controller is configured to control the air blower to maintain a rotational speed of the air blower in a case where a difference between the temperatures detected by the first temperature sensor and the second temperature sensor is equal to or above a predetermined value, and to control the air blower to lower the rotational speed of the air blower in a case where the difference between the temperatures detected by the first temperature sensor and the second temperature sensor is below the predetermined value. a first temperature sensor configured to detect a temperature of the air before passing through the heat exchanger; a second temperature sensor configured to detect a temperature of the air after passing through the heat exchanger; and a controller configured to control the air blower according to the temperatures detected by the first temperature sensor and the second temperature sensor, wherein the controller is configured to control the air blower to maintain a rotational speed of the air blower in a case where a difference between the temperatures detected by the first temperature sensor and the second temperature sensor is equal to or above a predetermined value, and to control the air blower to lower the rotational speed of the air blower in a case where the difference between the temperatures detected by the first temperature sensor and the second temperature sensor is below the predetermined value.