A temperature control apparatus comprising: a cover (110, 245), including a high thermal resistance insulating material, sized to cover and surround an existing radiator unit (100, 235, 535); an adjustable vent disposed at a top portion of the cover (110, 245); an actuator configured to adjust the vent between an open position and a closed position; a fan disposed inside the cover (110, 245) and configured to draw air from the top of the cover (110, 245) and blow air to the space outside the apparatus; a radiator temperature sensor (230, 530) disposed within the cover (110, 245), the radiator temperature sensor configured to measure temperature at the radiator (100, 235, 535); at least one remote temperature sensor (220, 540) disposed outside the cover (110, 245) and placed at a position away from the radiator unit (100, 235, 535), the at least one remote temperature sensor (220, 540) configured to measure an ambient temperature in the space around the radiator unit (100, 235, 535); and a controller (210, 520) coupled to a fan controller and to the actuator, in communication with the radiator temperature sensor (230, 530) and the at least one remote temperature sensor (220, 540), the controller (210, 520) being configured to operate the fan based on the at least one remote temperature sensor (220, 540) determining a set point temperature; wherein the controller (210, 520) is further configured to operate the actuator such that the vent is open when the remote temperature sensor (220, 540) indicates that the ambient temperature is below a set point temperature and the radiator temperature sensor (230, 530) indicates that the radiator unit (100, 235, 535) is warmer than the ambient temperature; and wherein the controller (210, 520) is configured to operate the actuator such that the vent is closed when the ambient temperature is greater than the set point temperature. a cover (110, 245), including a high thermal resistance insulating material, sized to cover and surround an existing radiator unit (100, 235, 535); an adjustable vent disposed at a top portion of the cover (110, 245); an actuator configured to adjust the vent between an open position and a closed position; a fan disposed inside the cover (110, 245) and configured to draw air from the top of the cover (110, 245) and blow air to the space outside the apparatus; a radiator temperature sensor (230, 530) disposed within the cover (110, 245), the radiator temperature sensor configured to measure temperature at the radiator (100, 235, 535); at least one remote temperature sensor (220, 540) disposed outside the cover (110, 245) and placed at a position away from the radiator unit (100, 235, 535), the at least one remote temperature sensor (220, 540) configured to measure an ambient temperature in the space around the radiator unit (100, 235, 535); and a controller (210, 520) coupled to a fan controller and to the actuator, in communication with the radiator temperature sensor (230, 530) and the at least one remote temperature sensor (220, 540), the controller (210, 520) being configured to operate the fan based on the at least one remote temperature sensor (220, 540) determining a set point temperature; wherein the controller (210, 520) is further configured to operate the actuator such that the vent is open when the remote temperature sensor (220, 540) indicates that the ambient temperature is below a set point temperature and the radiator temperature sensor (230, 530) indicates that the radiator unit (100, 235, 535) is warmer than the ambient temperature; and wherein the controller (210, 520) is configured to operate the actuator such that the vent is closed when the ambient temperature is greater than the set point temperature.