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.

Tags: 2.1, DOE, HERS, homeenergy.org, ratings

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