air-condition window or split unit or standing ac , new standing cooler , standing fans , wall mounted fans. delhi is hot get fan and ac fixed .

Terracotta tile roof as a truss over the main roof or broken ceramic tile mosaic over the existing terrace

Bring in clean air and get rid of hot air at about the same rate. You can achieve this with natural ventilation and chimney like in Victorian kitchens or by modern mechanical means - either way its the same concept.

why not use terracotta tiles by framin them with wood or say metal or aluminium may be. terracotta tiles can also be designed customized which m ay add to the beauty of the interior which is also the possibility.