In the wake of Green Building Revolution in India, more buildings are now attempting to build and certify green. The rating systems which are applicable for certification, evaluate these buildings based upon established criteria ranging from building envelope, water efficiency, energy efficiency, landuse, material optimization, indoor air quality to transport, operations, maintenance etc. However no credit is awarded to spatial design in achieving efficiency. In response to this issue, a new evaluation tool was evolved namely Difference in Uncomfortable Hours Outside Vs Inside. This tool evaluated the building in response to the climate in which it was placed. In simple terms, thermal conditions outside the building were compared with thermal conditions created inside due to design. However, to use DUHOI as an established tool for evaluating efficiency of architectural design in bringing in thermal comfort, bandwidths for each climatic zone have to be set. This can be done by evaluating best examples and also the seemingly bad examples based upon our understanding of passive architecture. This research work is limited to establishing a bandwidth of DUHOI for Hot-Dry climate of India. A range of buildings from hot-dry climatic zone are identified and simulated using whole building simulation tool. DUHOI is then calculated for each building. In this manner, a benchmark can be set and all buildings aspiring for green building certification would work for architectural design efficiency as a prerequisite. This would lead to an overall improvement in building performance.