I want to reduce energy and CO2 in building through simulation to find predicted time for retrofitting. which simulation software is suitable for aforementioned topic.
Energy Plus is a comprehensive software. You can also use DIVA for Rhino or DIVA for Grasshopper are useful if you're working on a parametric model. You can also look at the attached papers to see how DIVA works.
Conference Paper Design of Shading Screens Inspired by Persian Geometric Patt...
Conference Paper Form Exploration of Timber-based Folded Plate Domes
O.K, this depends on your level of energy software use and understanding as well as your accuracy requirement. Remember that all of these packages have different levels of rigour and user learning curve. SEFAIRA is a new internationally used and recognised program which is easy - on the Cloud - and calculates from simple REVIT or SketchUp models. It also utilises within its energy calculation Energy Plus. I believe that the software has also met the Best Test which is the calculation accuracy standard.
Revit will be enough for a beginner. One of the keys to fast and successful energy optimization is the automatic creation of a complete and accurate energy model directly from an architectural model. This approach means that no special model authoring is required for analysis. It works with a variety of modeling styles and levels of detail.