From the developer: "The program provides comprehensive heating & cooling load analysis with detailed breakdowns of specified conditions and computed results of heat gains and losses. Automatically calculates room round duct sizes plus room supply & newly added room return grille sizes including C.F.M.?s per grill, multiple returns for both room & central returns. Automatically calculates seasonal cooling operating costs based on any S.E.E.R., system size, hours of operation or utility rate you enter. Automatically highlights and compares seasonal heating operating costs between natural gas, electric strip heat, L.P. gas, fuel oil and heat pumps, all at the same time allowing for different efficiencies, costs & fuel energy content on each type. Inputs basic equipment information, costs & provides a simple payback your average customer can understand, based on the difference in cost & operational savings."