After success and popularity of first modeling challenge, ASHRAE LowDown Showdown will be part of ASHRAE and IBPSA-USA SimBuild 2016 Conference, Aug 10–12. Modeling challenge showcases work of several teams competing to model a net zero or below building. Competition gives conference attendees opportunity to work with vendors and developers to showcase their abilities using vendor’s simulation tools, innovative workflows, and creative problem solving to model a high performance building.