Simergy is a building energy simulation and analysis framework that enables you to predict the performance of your building design or remodel before it is built. Current simulations include: energy use, daylighting, and building energy code compliance assessment.

The Simergy user base includes over 1,200 users from nearly 450 organization in 60 countries. Recognizable names include: AECOM, Arup, Black and Veatch, Brown and Coldwell, California Energy Commission, CH2M Hill, Cundall, Duke Energy, Georgia Institute of Technology, Harris Engineering, HLM Architects, Indian Institute of Technology, McKinstry, Merck, Natural Resources Canada, Opterra Energy Services, Penn State University, Ramboll, Skanska, SOM, Stanford University, University of Southern California (USC), US Air Force (USAF), US Coast Guard (USCG), US General Services Administration (GSA), Vanderweil Engineers, WSP Global.

There are two versions of Simergy:

  • Simergy Standard – is limited (in terms of the size & complexity of models that can be created), but still useful for students learning to create building energy models – and is licensed at no cost
  • Simergy Professional – has more than double the features of Standard, supports unlimited building model size & complexity, comes with professional support and software updates, and is licensed at a very reasonable cost

Downloaded and used by thousands, and used routinely by hundreds, Simergy truly is the way to create building energy models in record time!


Simergy’s data is organized they way it’s users work – in terms of projects.  Within each project Simergy also enables users to define multiple design alternatives and then to compare simulation results between them. Notable features include:

  • Design Alternatives – summary table enables users to define and switch between different design alternatives.
  • Design Team – users can capture information about the project team for inclusion in reports and building permit documents
  • Weather Data selection – standard, Title 24, and custom sources
  • Design Dashboard – high level view of model completeness
  • Rule-based model validation checking, reporting, and repair


Site Design

Simergy enables user to define many things that will impact energy performance, but are outside of the building itself.  Examples include:

  • Adjacent sites, structures, and solar obstructions
  • Site power demand – like lighting, signage, and equipment
  • Site power generation – like generators, wind power, fuel cells, and CHP … as well as collector arrays for solar Hot Water, photovoltaic cells
  • Energy use and generation are, of course, factored into the project energy performance

Site Design

Building Design

Simergy provides many tools for creating the building model.  It also supports import of building information models (BIM) from other design applications.  The parametric basis for these models makes design changes quick and easy.  Specific features include:

  • Create new models using parametric Building Model Creator™
  • Import existing BIM in IFC or gbXML format
  • Create building model from DWG drawings
  • Tools for customizing space, zones, plena, and glazing
  • Customize material constructions in mass or individually
  • Complete support for daylighting and natural ventilation
  • Quick & easy, template-based zone loads and conditions

Building Model Creator™  Building – Custom Interiors  Building – Custom Facades Building – Daylighting

System Design

Simergy includes ‘best-in-class’ support for configuring virtually all of the HVAC system and components supported by EnergyPlus.  This includes all the low energy systems that have been added in the past few years.  This extensive feature set includes:

  • Create & manage loops using the Systems Model Creator™
  • Rapid template-driven systems configuration in early design
  • Access/control over all component parameters in detailed design
  • Ground-breaking and intuitive schedule editor
  • Rule-based validation checking ensures systems simulation
  • Automated system diagramming on import of IDF models

Building System Creator™  Zone HVAC Groups  Air Loops  Water Loops


BEM performance simulations are defined in Simergy and then run in EnergyPlus, the world’s premier full building, dynamic simulation engine, developed by the US Department of Energy.  Other types of simulations & Analyses are planned (see Code Checking below). Features include:

  • Configure Simulation parameters, output variables, output formats
  • Manage any number of runs/results for each configuration
  • Design Dashboard – high level view of model completeness
  • Rule-based model validation checking, reporting, and repair


EnergyPlus generates vast quantities of results data while simulating.  Simergy includes more than a dozen custom reports to summarize this data for the user, but also makes more than 100 standard report  generated by EnergyPlus easily accessible to the user.

  • Several pre-defined standard reports
  • Easy Access to EnergyPlus generated reports
  • Easily incorporate reports into client reports


Result Visualization

Simergy goes well beyond static reporting.  It includes a ‘best-in-class’ graphing/charting module that enables users to visualize virtually any of the thousands of variables that can be reported by EnergyPlus.  Such custom graphs/charts can then be incorporated into custom energy analysis reports the user is generating for the project client.

  • Graph/chart any combination of EnergyPlus variables
  • Customized layout/arrangement of graphics
  • Easily compare results from multiple design alternatives
  • Easily incorporate graphics into client reports

Result Visualization


A power aspect of Simergy is in easily reusable content stored in standard and custom libraries.  This content is accessible from virtually every palette and workspace.

  • More than 40 different license object types
  • Standardized, reusable objects – Examples include: Building elements, material construction, assemblies, performance curves, controls, HVAC components, and output variable sets
  • Easily update instances used in any number of design alternatives


Another powerful aspect of Simergy is in easily reusable configurations stored as templates.  Templates semi-automate model configuration that is tedious in other BEM applications.  They are used in a wide variety of contexts, from HVAC equipment configuration to Daylighting and natural ventilation, to variables to support reporting.

  • Data templates for: constructions, daylighting, location data, natural ventilation, zone loads/conditions, simulation params, etc.
  • System templates for: HVAC loops, Zone equipment, and more