The Incremental Cost Study Phase 4 Final Report presents baseline and efficient measure costs for six measures of interest: (1) VFD, variable displacement and load/no load air compressors; (2) commercial kitchen fryers; (3) commercial kitchen convection ovens; (4) refrigeration anti-sweat door heater controls; (5) refrigeration evaporator fan controls; and (6) commercial infrared heaters. The associated workbooks include raw data, data analysis, and final costs by subregion, as well as measure characterizations and summary tables.