In this paper, the result of a research project entitled: “investigating the possibility of using most recent HVAC systems in Iran” is presented. In this research, the present situation of HVAC systems installed in Iran is investigated, along with a detailed survey on newly developed and modern systems in the world . Propagation of using modern HVAC systems in Iran confronts a vast range of obstacles. the most important are: lack of compulsory codes & standards, technical factors and cultural problems.