Carmel Software has been developing and selling HVAC mechanical engineering software since 1995. Carmel's flagship product delivers thermal load calculations that give engineers information to appropriately size a building's HVAC systems. In addition, Carmel's software portfolio includes programs for duct sizing, refrigeration, pipe sizing, estimating, and life-cycle cost analysis. These applications are connected with the Revit platform for BIM via gbXML.
The benefits of this integration is that it eliminates the tedious process of manually inputting information for each room and system. . . a process that often takes many hours for large buildings. Another benefit is that all of the cooling and heating load results can be exported back to AutoCad MEP or Revit MEP to aid in duct and piping design.
The Loadsoft and Residential software programs are able to communicate with AutoCad MEP and Revit MEP using the Green Building XML schema (gbXML). gbXML was developed to facilitate the transfer of building information stored in CAD building information models, enabling integrated interoperability between building design models and a wide variety of engineering analysis tools and models available today. See http://www.gbxml.org/ for more information.