ExTLA Lite, a simple Excel-based calculation tool for energy consumption of residential building

A calculation tool for a single room. Insulation, types of windows, orientation, etc. can be studied.

ExTLA Lite 1.4.1

Manual for ExTLA Lite 1.4.1 (PDF)

What’s new in 1.4 from 1.3


ExTLA Core, a accurate calculation tool for annual heat load

ExTLA Core

Manual for ExTLA Core (PDF)


* Right click on the link and save the file.

* It has been confirmed this tool work with Excel 2007 and 2010 on MS Windows, not confirmed on MacOS.