Using passive systems is being popular in building sector. All these systems have their own performances and operation costs. To select the best system for energy saving in building, the life cycle costs and amount of energy saving of passive systems should be considered. This paper assesses the performance of the for passive systems, including roof pond, roof garden, wind catcher and ground cooling on energy saving of the building in hot and arid region in Iran. And then the cost of initial, operation and maintenance of each system is studied. To meet this goal, the individual impact of each system on a one-story residential house with the dimensions of 13.16m×11.11m×2.8m, located in Kerman city, Iran is calculated. This study is conducted for a period of 138-day from May to October, during which the use of cooling systems is considered to be required. The cost of construction, operation and maintenance and the energy saved by each system over a period of 20-year is evaluated. Results shows, wind catcher is most economical system to reduce energy consumption; meanwhile, roof garden is an expensive passive system in Iran. So using the roof garden for energy saving does not have economical rationalization.