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PHIUS Certified Data for Window Performance Program

Are you sourcing windows for a passive house or other high-performance building project?

The PHIUS Certified Data for Window Performance Program is your comprehensive guide to high-performance windows on the market today. For each window listed, you can download a certificate with climate-specific recommendations and comprehensive performance data, as well as download the THERM files for each window. 

Please note that on the certificate for each window the climate zone labels differ slightly from the IECC Climate Zone map (included in this linked document) as follows:

  • Certificate label 2 East = Map label 2A
  • Certificate label 2 West = Map label 2B
  • Certificate label Marine North = Map label 4C
  • Certificate label Marine South = Map label 3C

Are you a window manufacturer or supplier?

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

  • Get your products in front of passive building professionals looking for high-performance window solutions on their next project. 

  • Support the growth and adoption of passive building standards in North America.

  • Promote the growth of the high-performance building products market in North America by streamlining the process for passive house designers, construction professionals, and their clients to identify and source a wide range of high-performance windows tailored to their climate zone. 

For more information on the program and to submit your product for listing in the database, download a full description of the program and application.

Climate Zone Recommendation Criteria

  • Ratings are determined for specific combinations of frame, glazing, and spacer edge seal using EN-673, EN-410, and ISO 10077-based calculation methods. PHIUS recommends (but does not warrant) products for use in various climates, based on thermal performance.

  • Whole-window installed U-values are calculated including a nominal installation thermal bridge coefficient of 0.026 W/m.K (0.015 Btu/h.ft.F).

Have questions? We’ve got answers!

For more information about the program, or if you have any questions, please contact Graham Wright, Senior Scientist and Chair of the PHIUS Technical Committee at

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