A thermochromic indicator is vertically disposed on a rack. Such that the thermochromic indicator is visible from a distance. In some examples, the thermochromic indicator indicates a bulk air temperature and a gradient air temperature. The thermochromic indicator provides a real-time visual of air temperatures of computing equipment and devices housed within a computing facility. The thermochromic indicator may be vertically disposed on a front-face and/or a back-face or a rack. A plurality of thermochromic indicators may be disposed on a plurality of front-faces and/or back-faces of racks of an array of racks.