In the absence of thermal comfort standards in India, architects and designers have no choice, except to provide air conditioning to meet thermal comfort criteria for achieving green building rating for their projects and thus end up using more energy eventually. Significant Energy saving can be brought about by promoting naturally ventilated buildings as thermally comfortable building by retrofitting them with energy conserving measures for improving thermal performance. This paper analyses effect of various ECBC measures on thermal comfort in naturally ventilated hostel buildings in composite climate with respect to occupants’ responses vis-à- vis thermal comfort standards based on the adaptive model of ASHRAE 55-2010 and simulated model so as to prove naturally ventilated buildings to be thermally comfortable due to adaptive opportunities.