The version Steve Mann discusses in this Home Energy article (May/June, 2009) is ResRate Pro Version 2.8. It uses
the DOE-2.1E simulation engine to calculate hourly energy usage and determine
compliance with International Energy Conservation Code (IECC) building codes.
It also generates certified HERS reports, Fannie Mae energy-efficient mortgage
(EEM) reports, and federal tax credit documentation.... Read More at Home Energy magazine.