PHIUS (Passive House Institute US, Inc.) is a non-profit 501(c)(3) organization committed to making high-performance passive building the mainstream market standard. PHIUS trains and certifies professionals, maintains the PHIUS+ climate-specific passive building standard, certifies and quality assures passive buildings, and conducts research to advance high-performance building. Buildings that meet the PHIUS+ standard use 40–60 percent less energy for space conditioning than conventional buildings. PHIUS+ buildings provide superior indoor air quality, resilience during power outages, and an extremely quiet, comfortable indoor environment. Project teams are increasingly adopting passive building principles and the PHIUS+ standard for single-family, multifamily, and commercial construction to achieve Net Zero buildings.