The program is exclusively for residential buildings and residential HVAC equipment, and should not be used for commercial buildings. It includes input files with default values for ranch and two-story homes. For other buildings, the user must supply the construction details and HVAC equipment specifications.
Output is in the form of preformatted reports of hourly system performance.
Daily, monthly, and seasonal statistics are also available. The Fortran source code and PC executable version are provided. The software is distributed to run on a PC, but can also run on any computer with a Fortran compiler. The program is free. The program's method is based on the Rayleigh Integral, which is similar to the boundary element method.