Passive House Institute US (PHIUS)

The Passive House Institute US (PHIUS) is a 501c(3) nonprofit organization that provides training, education and research to promote implementation of Passive House Building Energy standard, as well as the design approach and techniques to accomplish that standard. 

 PHIUS engages in:
  • Constructing, measuring, and verifying performance of Passive Houses in all US climate zones, 
  • Conducting nationwide training and certification of Passive House Consultants,
  • Contributing to the development of minimized mechanical systems for heating, cooling, and dehumidification, 
  • Creating design guidelines for Passive Houses in all climate zones, 
  • Providing energy calculation and consulting services, 
  • Participating in presentations, meetings, conferences, etc. regarding passive construction.


The PHIUS+ Certification program combines a thorough passive house design verification protocol with a stringent Quality Assurance and Quality Control (QA/QC) program performed on site by highly skilled and specialized PHIUS+ Raters. 

The benefits of PHIUS+ certification include: 

  • Comprehensive design and energy model review 
  • Rigorous quality assurance 
  • RESNET HERS Index Score 
  • One-Stop Certification Shopping Now Encompasses U.S. DOE Challenge Home 
  • Listing on the PHIUS+ Certified Projects Database


At its September, 2012 national conference in Denver, PHIUS rolled out the first phase of the domestic (North American) passive house window certification program. 

The initial goal is to calculate and make available valid thermal performance parameters for US windows so that designers will have more choices and can do building energy models with more confidence in their accuracy. 

We encourage high-performance window manufacturers to participate in the Certified Data Program for Window Performance.

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© 2013 Passive House Alliance
San Diego Chapter

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