Roof top equipment is often concealed for aesthetics reasons, by a solid or louvered parapet walls aka “Architectural Screens”. This results in inefficient dispersion of exhaust air and reduces the thermal efficiency of the equipment inside the screens. This work estimates excess energy used at an 8000 tons district cooling plants when cooling tower fan operates at higher speeds to compensate for the entrainment and recirculation of exhaust air caused by architectural walls around a cooling tower. Air properties for two locations: 1) inside the walls near the cooling tower and 2) away from it, outside the walls were monitored and analyzed.