The purpose of this research is to simulate the impact of climate changes on the need for energy consumption in household cooling and heating systems using degree-day index. To this end, general circulation model has been applied to identify future climate changes and simulate degree-day values. The research findings show an increase of energy consumption for cooling in households in 2075. Also, with warm seasons prolonging and cold seasons shrinking in a year, the need for the continuous supply of energy consumption for air cooling and ventilation increases. (C) 2012 Elsevier Ltd. All rights reserved.