The Windows and Daylighting Group at Lawrence Berkeley National Laboratory (LBNL) has developed a variety of software tools. This page describes those programs, program components and macros that relate most directly to optical properties of windows.

Software Tools

WINDOW5/6 
for analyzing window thermal and optical performance 

THERM 
for analyzing two-dimensional heat transfer through building products 

Optics5 
for analyzing optical properties of glazing systems 

International Glazing Database (IGDB)
Optical data for glazing products used by WINDOW 5.2 and Optics5.1 including NFRC approved products.

COMFEN
A PC Program for calculating the heating and cooling energy use, and visual and thermal comfort, of commercial building facades.

RESFEN  -- Version 5.0 now available !
A PC program for calculating the heating and cooling energy use of windows in residential buildings 

Software Version Overview and Compatibility
A table listing the currently down loadable programs showing the versions that are compatible with each other