AERCalc Software Downloads

Version 1.2.10
Released: November 12, 2018

Release Notes:

Installation Notes

Uninstall any previous AERCalc version, including the Appdata directory

Before installing this latest version, please uninstall any previous version of AERCalc. In addition, you will need to delete (by hand in Windows Explorer) the "Appdata" directory that AERCalc creates when it runs. This directory is located here:


It is not normally visible in Windows Explorer, so you may need to make it "visible" in the Explorer view settings to "view hidden file, folders and drives"

If you do not delete this directory, the new version of AERCalc will not function properly.

Copy or Move files in Appdata that you don't want to delete

If you want to save any files that you have already calculated, the simplest way to do that is to use the File/Save As feature, which makes a Project, and stores the information from the following directories in the folder name that you specify when clicking on File/Save As:

  • db subdirectory: this is where the program stores the AERCalc database. If you want to save that database because you have imported lots of files, you may want to 
  • bsdf subdirectory: this is where the program stores the Energy Plus IDF files it creates when the WINDOW records are imported.

W7 subdirectory: this directory contains the default WINDOW 7 database. If you have used it for importing records into AERCalc, you may want to move/copy it to another location

Install Adobe AIR 

If you have never installed AERCalc you will need to install Adobe AIR.

Adobe AIR is now supported by Harman. You will need to download and run the Harman Adobe AIR runtime installer in order to install this version of COMFEN, as well as to run COMFEN. 

Here is a link to the Harman Adobe AIR runtime installation page. You will need to download and install "Adobe AIR for Windows".


Install the latest versions of WINDOW 7.7 and THERM 7.7


Program Updates

This version has the following change:

WINDOW and THERM are updated

  • The latest versions of WINDOW (7.7.01) and THERM (7.7.01) have been included. They must be installed separately from AERCalc

Debugging option in Preferences

  • Added a setting in Preferences to "Keep intermediate files" to aid in debugging problems with the program 

Do not use commas in names

  • Commas in the names of Windows, Glazing Systems or Frames in WINDOW will generate errors when they are turned into EnergyPlus inputfiles (IDF files). Therefore, do not use commas in either of those names

Sealed products added to sample WINDOW database

  • Four new products have been added to the sample WINDOW database that comes with the AERCalc installation (called AERCalSample.mdb, located in your "AppData\LBNL\aercalc\W7" directory​.
    • Sealed Roller Shade:
      • Light colored low openness Indoor 
      • Dark colored low openness Outdoor
    • Sealed Solar Shade:
      • Light colored low openness Indoor
      • Dark colored low openness Outdoor