The Home Energy Rating System (HERS) BESTEST was applied to a building energy simulation computer program. The agreement between the simulation computer program predictions and those of the reference programs (DOE-2.1E, BLAST 3.0, and SERIRES/SUNCODE 5.7) was good. It was found that major differences between program predictions can be due to different simulation inputs. It was then recommended that the HERS BESTEST manual be modified to include detailed information about the house models used to generate the results with the reference software tools. The results also indicated that the HERS BESTEST can be an effective means of diagnosing potential problems with simulation software.

Units: SI