Over the last few years we have seen forest fires along the west coast that make clear the urgency of building sustainably. The west coast states are all on a path towards Net Zero sustainable home building. All three west coast states are using advanced codes that challenge many builders to keep up. Heating and cooling is the largest mechanical energy use in most homes and the largest opportunity for energy savings (after the envelope). This session will address the following issues to help builders make the transition to sustainable and resilient home building: