This study outlines the economic feasibility for utilization of solar heating systems for some buildings in the selected typical cities in different climatic regions of Iran. The feasibility of application of the solar heating systems has been determined by means of proper economic criteria and a life time of 25 years for capital investment. It has been found that utilization of such systems could be feasible in some of the regions for specific applications. (C) 2000 Elsevier Science Ltd. All rights reserved.