I'm surprised the community is down-voting this question. This is exactly why whole building energy modeling programs were created.

Create one or more models of typical buildings in Iran. Then add in serially a more efficient component. You can then determine which component/retrofit is most economical. See this and link to the full report here

I'm surprised the community is down-voting this question. This is exactly why whole building energy modeling programs were created.

Create one or more models of typical buildings in Iran. Then add in serially a more efficient component. You can then determine which component/retrofit retrofit is most economical. See this