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The Phius Certification Guidebook is the one-stop-shop for all things related to the Phius project certification program.

Use for any project with more than one dwelling unit. This includes townhomes, duplexes, traditional multifamily, dormitories, long stay hotels etc... following the same protocol as the Multifamily Lighting and Miscellaneous Electric Loads (MEL) document.

This document outlines the prerequisites and process of becoming a Phius Certified Rater or Phius Certified Verifier, eligibility to inspect and verify Phius projects, and the responsibilities of the Rater/Verifier in the certification of Phius projects.

This calculator should be used to determine the 'Mechanical Room' temperature when a mechanical ventilation device is located outside of the thermal envelope. (eg. the roof)

The climate map provides data related to the thermal enclosure and mechanical system performance levels required to achieve Phius CORE Prescriptive. It is similar to the same data as the Phius CORE Prescriptive snapshot, except it's displayed on a map. It is often helpful to use this map to find the location/climate data set closest to your project site.

This calculator is used to determine project-specific performance criteria for projects in Japan pursuing Phius Certification.

In 2022, a new version of WUFI Passive will be released that includes all Phius CORE and Phius ZERO updates. Until then, follow instructions in this document to model your project under either path.

This calculator is used to determine project-specific performance criteria for Phius 2021 Certification.