Fenestration Simulation Software Training: Computer Simulation of Fenestration Products Using Berkeley Lab WINDOW and THERM - United States


The use of finite element analysis to determine heat gains/losses from fenestration products (windows, doors, skylights, etc) is very prevalent for research and design, as well as determining performance for meeting building code requirements.

This two-day instructor led course explains how to accurately use readily-available software to simulate the thermal performance of fenestration products. Participants will learn to setup and properly use Berkeley Lab WINDOW and THERM for determining a fenestration product’s U-factor, Solar Heat Gain Coefficient, Visible Transmittance, and Condensation Resistance.


Course Topics

  • Performance Values
  • Codes, Test Methods & Standards
  • Simulation Process: Berkeley Lab WINDOW
  • Simulation Process: THERM
  • Simulation Process: Putting it all Together


Upon completion of this course, participants will be able to:

  • Describe the factors that contribute to overall performance
  • Identify building codes and standards, and test methods related to fenestration software
  • Properly use the simulation process software, including Berkeley Lab WINDOW and THERM
  • Navigate and use the menus, toolbars, and libraries in these programs

Please note – this is a computer-based training and there will be many class exercises to be completed during the training so you will need to bring your own laptop. The software of Berkeley Lab WINDOW and THERM must be downloaded prior to the start of the class. The latest versions of WINDOW (7.5) AND THERM (7.5) can be downloaded for free from LBNL at the following link: https://windows.lbl.gov/software/

No previous training is required but review of the NFRC Simulation Manual (www.nfrc.org) is a very helpful guide illustrating and outlining the creation of glazing systems in Berkeley Lab WINDOW and modeling frame/sash components in THERM.

Target Audience

  • Architects
  • Building Developers
  • Code Developers
  • Construction Industry
  • Consultants
  • Fenestration Manufacturers
  • Specification Writers

Continuing Education Units (CEUs)

  • 1.3 IACET CEUs; contact your local jurisdiction for CEU recognition.
  • This course is AIA CES Approved. AIA members will receive 16 HSU Learning Units for participating in this instructor led training.


Dennis Anderson is the technical leader for UL’s Building Envelope Performance Test Lab. He brings 24 years of experience in fenestration testing, accreditation, and certification. In Dennis’ role he is the technical lead for UL’s thermal, acoustical, and simulation areas.

Dennis is a NFRC certified simulator and chairs ASTM task groups. He has served in the U.S. Army and received his Bachelor of Science degree in engineering from St. Cloud State University in Minnesota.

If you are interested in taking this as a private workshop, please contact Dennis Anderson.

Please note that these workshops are limited to 25 participants. If you are interested in a private workshop, please contact us for more information.

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Time Requirement


Instructor-Led 2 days

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