Abstract: A facility-equipment temperature control system allows for controlling the surface temperature of the facility equipment at a low cost and reduction in workload. The facility-equipment temperature control system includes a non-fixed image-capturing device and an image-processing device. The image-capturing device captures the image of the surface of facility equipment to obtain a visible image and a thermal image. Based on the shape information of the common reference part existing in the first visible image and the second visible image, the image-processing device sets a comparison area at the same position and in the same range on the first visible image and the second visible image. In addition, the image-processing device corrects the deviation of the field angle in the comparison area of the first thermal image and the second thermal image and displays the temperature-difference-information, which was obtained by comparing the corrected thermal images on the display screen.