Accuracy of Home Energy Rating Systems

Plot graph of Predicted Energy Costs vs Actual Costs
August 1997

None of the three Home Energy Rating Systems (HERS) we tested showed any clear relationship between the predicted and actual energy cost of a rated house. While accuracy does not appear to be major concern of the HERS industry or lenders who participate in HERS programs, it is important for consumers who invest based on HERS ratings. Accuracy can be improved with additional research and possibly fundamental modifications in the rating systems.


Edward Vine (510) 486-6047