This paper examines the impact of passive heating and cooling design options for climate change scenarios in Pune, India, both now and in the future. For the Typical Meteorological Year (TMY), 2050, and 2080 time slices of the Intergovernmental Panel on Climate Change (IPCC) A2 (medium-high) scenario, weather data were compiled. The findings show a strong correlation between the annual bioclimatic summer and winter discomfort hours and the optimum annual cooling and heating energy consumption for the changing climate scenarios. Adaptive thermal comfort graphs using ASHRAE 55 guidelines psychometric chart prepared using climate consultant shows that there will be drop in comfortable from 13% to 11% in 2050 and 9% in 2080. Due to rise in temp. summer months (April, May & June) reduces the maximum comfort hrs.by 2080 and building will require 49% cooling. Due to this energy consumption increase drastically.