The overall goal of this project is to develop ways that UFAD systems can be successfully simulated in California climates with DOE-2 programs that have no explicit UFAD models. These new methods should improve upon the current “work around” solutions offered in Title-24 alternative calculation methods (ACM) manuals in 2005 and 2008 standards [ACM 2005, 2008][CEC 2008] and other ad hoc methods used by designers.