Building Energy Modeling with IESVE

IES Energy Modeling Software

Building energy modeling predicts building energy consumption, CO2 emissions, peak demands, energy cost and renewable energy production.

Whole building energy simulation analysis capabilities of the IESVE software tools covers a wide range of assessment types from energy efficiency, comfort, ventilation, HVAC performance and optimization. Design for the future with low impact energy systems and strategies.

Electrification and Decarbonization

Building Energy Modeling (BEM) with the IES Virtual Environment software is the perfect industry design tool for electrification and decarbonization of the built environment. Various design strategies are available with decarbonization as an end goal.

Passive Design

Solar shading, site orientation, natural ventilation, passive solar heating, etc.

Energy Conservation

High-performance constructions, reduced infiltration, efficient lighting, daylight harvesting, ceiling fans, etc.

Energy Efficiency

Energy-recovery ventilators, demand-controlled ventilation, CHP, air+water economizers, VSD fans+pumps, etc.


Heat pumps (air/water/geo), heat-recovery chillers, HPWH, low-temp radiant heating, etc.

Renewable Energy Technology

Solar PV, wind turbines, solar hot-water pre-heating, geothermal heat exchange, etc.

Energy Storage

Electric battery storage with TOU control or Demand Response, Thermal Energy Storage.

APACHE Simulation in IESVE Software

Widely regarded as the best whole-building energy simulation engine in the world, the powerful APACHE engine used in the IES Virtual Environment software has unrivalled flexibility and features.

  • Integration: 1-way and 2-way model simulation links with other IESVE Applications & simulation engines for solar, daylight, airflow and HVAC.  
  • Captures building performance metrics for energy, water, carbon, cost, comfort, loads and more. 
  • Extensive range of predictive simulation results variables for buildings, systems, zones, room and surfaces. 
  • Simulation results available for annual, monthly, hourly, and sub-hourly analysis. 1-minute simulation time-step available. 
  • Assess thermodynamic performance of active and passive systems, with the ability to perform multiple simultaneous simulations in parallel using the Parallel Simulation Manager.
  • APACHE automates the creation of energy code baseline models for compliance comparisons. E.g. ASHRAE 90.1, NECB, Title 24, IECC, etc. 
  • ASHRAE 140 Validated and EPAct Approved
  • Export results to MicroFlo as boundary conditions for detailed CFD analysis.
apache diagram

Multi-Core Simulation Speed Enhancements: ApacheSim

Increase hourly annual simulation speed, by using IES’s ApacheSim simulation engine and the Parallel Simulation Manager feature by using more of the available cores on your computer.

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Metrics and Reports

The range of Building Energy Modeling metrics from IESVE Software include Site Energy, Source Energy, Carbon Emissions, Energy Cost, PUE, Peak Demands, ASHRAE 90.1 PCI, TEDI and much more.

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Net-Zero Energy Success Stories


Join our On-Demand Learning courses to take a closer look at our sophisticated tools for buiding energy modeling. Enrol today!

On-Demand Training: Dynamic Simulation & Results Analysis

Learn how to populate a project with profiles, thermal template data and constructions in preparation for performing dynamic thermal simulations.

On-Demand Training

Browse our full range of courses designed to help you to delve deeper into topics that will enhance your knowledge and application of our technology.

Weather Files

Climate will clearly play a key role in the performance of any building so it is important to use the appropriate location settings for any analysis. For Apache dynamic simulations in IESVE a simulation weather file is required. 

Explore our database of global weather applicable to a range of building types. Design for the future with any building in any location. 

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Got a Question?

To find out more about how our energy modeling software can benefit you, please contact our Sales team.