Passive House About Passive House Criteria The Passive House Institute (PHI) is an independent research institute dedicated to the research and development of effective strategies to optimize energy efficiency in buildings. The Passive House Standard encourages utilization of construction concepts, building materials, and software tools which improve thermal comfort with minimum energy consumption. Integrating the Passive House Standard into building design increases operational effectiveness, thus reducing energy consumption and utility costs. ASSA ABLOY actively pursues solutions which maximize building performance through optimized thermal and energy efficiency. ASSA ABLOY works directly with our customers to achieve Passive House certification, providing clear and concise documentation illustrating our respective contribution.